High School Math 2015 Common Core Algebra 1 Student Edition Grade 8/9
15th Edition
ISBN: 9780133281149
Author: Prentice Hall
Publisher: Prentice Hall
expand_more
expand_more
format_list_bulleted
Question
Chapter 6.4, Problem 3MCQ
To determine
To calculate: solve system of equations by graph. Tell whether the system has one solution, infinitely many solutions, or no solutions.
Expert Solution & Answer
Answer to Problem 3MCQ
No solutions
Explanation of Solution
Given information:
Calculation:
Let’s plot the graph of both the lines, the intersecting points will be our final solution.
Here, both the lines are parallel, so they do not intersect at all. Therefore, the system will have no solutions.
Chapter 6 Solutions
High School Math 2015 Common Core Algebra 1 Student Edition Grade 8/9
Ch. 6.1 - Prob. 1PCh. 6.1 - Prob. 2PCh. 6.1 - Prob. 3PCh. 6.1 - Prob. 1LCCh. 6.1 - Prob. 2LCCh. 6.1 - Prob. 3LCCh. 6.1 - Prob. 4LCCh. 6.1 - Prob. 5LCCh. 6.1 - Prob. 6LCCh. 6.1 - Prob. 7LC
Ch. 6.1 - Prob. 8LCCh. 6.1 - Prob. 9LCCh. 6.1 - Prob. 10PPECh. 6.1 - Prob. 11PPECh. 6.1 - Prob. 12PPECh. 6.1 - Prob. 13PPECh. 6.1 - Prob. 14PPECh. 6.1 - Prob. 15PPECh. 6.1 - Prob. 16PPECh. 6.1 - Prob. 17PPECh. 6.1 - Prob. 18PPECh. 6.1 - Prob. 19PPECh. 6.1 - Prob. 20PPECh. 6.1 - Prob. 21PPECh. 6.1 - Prob. 22PPECh. 6.1 - Prob. 23PPECh. 6.1 - Prob. 24PPECh. 6.1 - Prob. 25PPECh. 6.1 - Prob. 26PPECh. 6.1 - Prob. 27PPECh. 6.1 - Prob. 28PPECh. 6.1 - Prob. 29PPECh. 6.1 - Prob. 30PPECh. 6.1 - Prob. 31PPECh. 6.1 - Prob. 32PPECh. 6.1 - Prob. 33PPECh. 6.1 - Prob. 34PPECh. 6.1 - Prob. 35PPECh. 6.1 - Prob. 36PPECh. 6.1 - Prob. 37PPECh. 6.1 - Prob. 38PPECh. 6.1 - Prob. 39PPECh. 6.1 - Prob. 40PPECh. 6.1 - Prob. 41PPECh. 6.1 - Prob. 42PPECh. 6.1 - Prob. 43STPCh. 6.1 - Prob. 44STPCh. 6.1 - Prob. 45STPCh. 6.1 - Prob. 46MRCh. 6.1 - Prob. 47MRCh. 6.1 - Prob. 48MRCh. 6.1 - Prob. 49MRCh. 6.1 - Prob. 50MRCh. 6.1 - Prob. 51MRCh. 6.1 - Prob. 52MRCh. 6.1 - Prob. 53MRCh. 6.1 - Prob. 54MRCh. 6.1 - Prob. 55MRCh. 6.1 - Prob. 56MRCh. 6.1 - Prob. 57MRCh. 6.1 - Prob. 5CBCh. 6.1 - Prob. 6CBCh. 6.1 - Prob. 7CBCh. 6.1 - Prob. 8CBCh. 6.2 - Prob. 1CBCh. 6.2 - Prob. 2CBCh. 6.2 - Prob. 3CBCh. 6.2 - Prob. 1PCh. 6.2 - Prob. 2PCh. 6.2 - Prob. 3PCh. 6.2 - Prob. 4PCh. 6.2 - Prob. 1LCCh. 6.2 - Prob. 2LCCh. 6.2 - Prob. 3LCCh. 6.2 - Prob. 4LCCh. 6.2 - Prob. 5LCCh. 6.2 - Prob. 6LCCh. 6.2 - Prob. 7LCCh. 6.2 - Prob. 8LCCh. 6.2 - Prob. 9LCCh. 6.2 - Prob. 10LCCh. 6.2 - Prob. 11PPECh. 6.2 - Prob. 12PPECh. 6.2 - Prob. 13PPECh. 6.2 - Prob. 14PPECh. 6.2 - Prob. 15PPECh. 6.2 - Prob. 16PPECh. 6.2 - Prob. 17PPECh. 6.2 - Prob. 18PPECh. 6.2 - Prob. 19PPECh. 6.2 - Prob. 20PPECh. 6.2 - Prob. 21PPECh. 6.2 - Prob. 22PPECh. 6.2 - Prob. 23PPECh. 6.2 - Prob. 24PPECh. 6.2 - Prob. 25PPECh. 6.2 - Prob. 26PPECh. 6.2 - Prob. 27PPECh. 6.2 - Prob. 28PPECh. 6.2 - Prob. 29PPECh. 6.2 - Prob. 30PPECh. 6.2 - Prob. 31PPECh. 6.2 - Prob. 32PPECh. 6.2 - Prob. 33PPECh. 6.2 - Prob. 34PPECh. 6.2 - Prob. 35PPECh. 6.2 - Prob. 36PPECh. 6.2 - Prob. 37PPECh. 6.2 - Prob. 38PPECh. 6.2 - Prob. 39PPECh. 6.2 - Prob. 40PPECh. 6.2 - Prob. 41PPECh. 6.2 - Prob. 42PPECh. 6.2 - Prob. 43PPECh. 6.2 - Prob. 1MPCh. 6.3 - Prob. 1PCh. 6.3 - Prob. 2PCh. 6.3 - Prob. 3PCh. 6.3 - Prob. 4PCh. 6.3 - Prob. 5PCh. 6.3 - Prob. 1LCCh. 6.3 - Prob. 2LCCh. 6.3 - Prob. 3LCCh. 6.3 - Prob. 4LCCh. 6.3 - Prob. 5LCCh. 6.3 - Prob. 6LCCh. 6.3 - Prob. 7PPECh. 6.3 - Prob. 8PPECh. 6.3 - Prob. 9PPECh. 6.3 - Prob. 10PPECh. 6.3 - Prob. 11PPECh. 6.3 - Prob. 12PPECh. 6.3 - Prob. 13PPECh. 6.3 - Prob. 14PPECh. 6.3 - Prob. 15PPECh. 6.3 - Prob. 16PPECh. 6.3 - Prob. 17PPECh. 6.3 - Prob. 18PPECh. 6.3 - Prob. 19PPECh. 6.3 - Prob. 20PPECh. 6.3 - Prob. 21PPECh. 6.3 - Prob. 22PPECh. 6.3 - Prob. 23PPECh. 6.3 - Prob. 24PPECh. 6.3 - Prob. 25PPECh. 6.3 - Prob. 26PPECh. 6.3 - Prob. 27PPECh. 6.3 - Prob. 28PPECh. 6.3 - Prob. 29PPECh. 6.3 - Prob. 30PPECh. 6.3 - Prob. 31PPECh. 6.3 - Prob. 32PPECh. 6.3 - Prob. 33PPECh. 6.3 - Prob. 34PPECh. 6.3 - Prob. 35PPECh. 6.3 - Prob. 36PPECh. 6.3 - Prob. 37PPECh. 6.3 - Prob. 38PPECh. 6.3 - Prob. 39PPECh. 6.3 - Prob. 40PPECh. 6.3 - Prob. 41PPECh. 6.3 - Prob. 42PPECh. 6.3 - Prob. 43PPECh. 6.3 - Prob. 44PPECh. 6.3 - Prob. 45STPCh. 6.3 - Prob. 46STPCh. 6.3 - Prob. 47STPCh. 6.3 - Prob. 48STPCh. 6.3 - Prob. 49STPCh. 6.3 - Prob. 50MRCh. 6.3 - Prob. 51MRCh. 6.3 - Prob. 52MRCh. 6.3 - Prob. 53MRCh. 6.3 - Prob. 54MRCh. 6.3 - Prob. 55MRCh. 6.3 - Prob. 56MRCh. 6.3 - Prob. 1CBCh. 6.3 - Prob. 2CBCh. 6.3 - Prob. 3CBCh. 6.3 - Prob. 4CBCh. 6.3 - Prob. 5CBCh. 6.3 - Prob. 6CBCh. 6.3 - Prob. 7CBCh. 6.4 - Prob. 1PCh. 6.4 - Prob. 2PCh. 6.4 - Prob. 3PCh. 6.4 - Prob. 1LCCh. 6.4 - Prob. 2LCCh. 6.4 - Prob. 3LCCh. 6.4 - Prob. 4LCCh. 6.4 - Prob. 5LCCh. 6.4 - Prob. 6LCCh. 6.4 - Prob. 7PPECh. 6.4 - Prob. 8PPECh. 6.4 - Prob. 9PPECh. 6.4 - Prob. 10PPECh. 6.4 - Prob. 11PPECh. 6.4 - Prob. 12PPECh. 6.4 - Prob. 13PPECh. 6.4 - Prob. 14PPECh. 6.4 - Prob. 15PPECh. 6.4 - Prob. 16PPECh. 6.4 - Prob. 17PPECh. 6.4 - Prob. 18PPECh. 6.4 - Prob. 19PPECh. 6.4 - Prob. 20PPECh. 6.4 - Prob. 21PPECh. 6.4 - Prob. 22PPECh. 6.4 - Prob. 23PPECh. 6.4 - Prob. 24PPECh. 6.4 - Prob. 25PPECh. 6.4 - Prob. 26PPECh. 6.4 - Prob. 27PPECh. 6.4 - Prob. 28PPECh. 6.4 - Prob. 29STPCh. 6.4 - Prob. 30STPCh. 6.4 - Prob. 31STPCh. 6.4 - Prob. 32MRCh. 6.4 - Prob. 33MRCh. 6.4 - Prob. 34MRCh. 6.4 - Prob. 35MRCh. 6.4 - Prob. 36MRCh. 6.4 - Prob. 37MRCh. 6.4 - Prob. 1MCQCh. 6.4 - Prob. 2MCQCh. 6.4 - Prob. 3MCQCh. 6.4 - Prob. 4MCQCh. 6.4 - Prob. 5MCQCh. 6.4 - Prob. 6MCQCh. 6.4 - Prob. 7MCQCh. 6.4 - Prob. 8MCQCh. 6.4 - Prob. 9MCQCh. 6.4 - Prob. 10MCQCh. 6.4 - Prob. 11MCQCh. 6.4 - Prob. 12MCQCh. 6.4 - Prob. 13MCQCh. 6.4 - Prob. 14MCQCh. 6.4 - Prob. 15MCQCh. 6.4 - Prob. 16MCQCh. 6.4 - Prob. 17MCQCh. 6.4 - Prob. 18MCQCh. 6.4 - Prob. 19MCQCh. 6.4 - Prob. 20MCQCh. 6.4 - Prob. 21MCQCh. 6.5 - Prob. 1PCh. 6.5 - Prob. 2PCh. 6.5 - Prob. 3PCh. 6.5 - Prob. 4PCh. 6.5 - Prob. 5PCh. 6.5 - Prob. 1LCCh. 6.5 - Prob. 2LCCh. 6.5 - Prob. 3LCCh. 6.5 - Prob. 4LCCh. 6.5 - Prob. 5LCCh. 6.5 - Prob. 6LCCh. 6.5 - Prob. 7LCCh. 6.5 - Prob. 8PPECh. 6.5 - Prob. 9PPECh. 6.5 - Prob. 10PPECh. 6.5 - Prob. 11PPECh. 6.5 - Prob. 12PPECh. 6.5 - Prob. 13PPECh. 6.5 - Prob. 14PPECh. 6.5 - Prob. 15PPECh. 6.5 - Prob. 16PPECh. 6.5 - Prob. 17PPECh. 6.5 - Prob. 18PPECh. 6.5 - Prob. 19PPECh. 6.5 - Prob. 20PPECh. 6.5 - Prob. 21PPECh. 6.5 - Prob. 22PPECh. 6.5 - Prob. 23PPECh. 6.5 - Prob. 24PPECh. 6.5 - Prob. 25PPECh. 6.5 - Prob. 26PPECh. 6.5 - Prob. 27PPECh. 6.5 - Prob. 28PPECh. 6.5 - Prob. 29PPECh. 6.5 - Prob. 30PPECh. 6.5 - Prob. 31PPECh. 6.5 - Prob. 32PPECh. 6.5 - Prob. 33PPECh. 6.5 - Prob. 34PPECh. 6.5 - Prob. 35PPECh. 6.5 - Prob. 36PPECh. 6.5 - Prob. 37PPECh. 6.5 - Prob. 38PPECh. 6.5 - Prob. 39PPECh. 6.5 - Prob. 40PPECh. 6.5 - Prob. 41PPECh. 6.5 - Prob. 42STPCh. 6.5 - Prob. 43STPCh. 6.5 - Prob. 44STPCh. 6.5 - Prob. 45MRCh. 6.5 - Prob. 46MRCh. 6.5 - Prob. 47MRCh. 6.5 - Prob. 48MRCh. 6.5 - Prob. 49MRCh. 6.6 - Prob. 1PCh. 6.6 - Prob. 2PCh. 6.6 - Prob. 3PCh. 6.6 - Prob. 1LCCh. 6.6 - Prob. 2LCCh. 6.6 - Prob. 3LCCh. 6.6 - Prob. 4LCCh. 6.6 - Prob. 5LCCh. 6.6 - Prob. 6LCCh. 6.6 - Prob. 7PPECh. 6.6 - Prob. 8PPECh. 6.6 - Prob. 9PPECh. 6.6 - Prob. 10PPECh. 6.6 - Prob. 11PPECh. 6.6 - Prob. 12PPECh. 6.6 - Prob. 13PPECh. 6.6 - Prob. 14PPECh. 6.6 - Prob. 15PPECh. 6.6 - Prob. 16PPECh. 6.6 - Prob. 17PPECh. 6.6 - Prob. 18PPECh. 6.6 - Prob. 19PPECh. 6.6 - Prob. 20PPECh. 6.6 - Prob. 21PPECh. 6.6 - Prob. 22PPECh. 6.6 - Prob. 23PPECh. 6.6 - Prob. 24PPECh. 6.6 - Prob. 25PPECh. 6.6 - Prob. 26PPECh. 6.6 - Prob. 27PPECh. 6.6 - Prob. 28PPECh. 6.6 - Prob. 29PPECh. 6.6 - Prob. 30PPECh. 6.6 - Prob. 31PPECh. 6.6 - Prob. 32PPECh. 6.6 - Prob. 33PPECh. 6.6 - Prob. 34PPECh. 6.6 - Prob. 35PPECh. 6.6 - Prob. 36PPECh. 6.6 - Prob. 37PPECh. 6.6 - Prob. 38PPECh. 6.6 - Prob. 1MPCh. 6.6 - Prob. 7CBCh. 6.6 - Prob. 8CBCh. 6.6 - Prob. 9CBCh. 6.6 - Prob. 10CBCh. 6.6 - Prob. 11CBCh. 6.6 - Prob. 12CBCh. 6.6 - Prob. 13CBCh. 6.6 - Prob. 14CBCh. 6 - Prob. 1GRCh. 6 - Prob. 2GRCh. 6 - Prob. 3GRCh. 6 - Prob. 4GRCh. 6 - Prob. 5GRCh. 6 - Prob. 6GRCh. 6 - Prob. 7GRCh. 6 - Prob. 8GRCh. 6 - Prob. 9GRCh. 6 - Prob. 10GRCh. 6 - Prob. 11GRCh. 6 - Prob. 12GRCh. 6 - Prob. 13GRCh. 6 - Prob. 14GRCh. 6 - Prob. 15GRCh. 6 - Prob. 16GRCh. 6 - Prob. 17GRCh. 6 - Prob. 18GRCh. 6 - Prob. 1CRCh. 6 - Prob. 2CRCh. 6 - Prob. 3CRCh. 6 - Prob. 4CRCh. 6 - Prob. 5CRCh. 6 - Prob. 6CRCh. 6 - Prob. 7CRCh. 6 - Prob. 8CRCh. 6 - Prob. 9CRCh. 6 - Prob. 10CRCh. 6 - Prob. 11CRCh. 6 - Prob. 12CRCh. 6 - Prob. 13CRCh. 6 - Prob. 14CRCh. 6 - Prob. 15CRCh. 6 - Prob. 16CRCh. 6 - Prob. 17CRCh. 6 - Prob. 18CRCh. 6 - Prob. 19CRCh. 6 - Prob. 20CRCh. 6 - Prob. 21CRCh. 6 - Prob. 22CRCh. 6 - Prob. 23CRCh. 6 - Prob. 24CRCh. 6 - Prob. 25CRCh. 6 - Prob. 26CRCh. 6 - Prob. 27CRCh. 6 - Prob. 28CRCh. 6 - Prob. 29CRCh. 6 - Prob. 30CRCh. 6 - Prob. 31CRCh. 6 - Prob. 32CRCh. 6 - Prob. 1CTCh. 6 - Prob. 2CTCh. 6 - Prob. 3CTCh. 6 - Prob. 4CTCh. 6 - Prob. 5CTCh. 6 - Prob. 6CTCh. 6 - Prob. 7CTCh. 6 - Prob. 8CTCh. 6 - Prob. 9CTCh. 6 - Prob. 10CTCh. 6 - Prob. 11CTCh. 6 - Prob. 12CTCh. 6 - Prob. 13CTCh. 6 - Prob. 14CTCh. 6 - Prob. 15CTCh. 6 - Prob. 16CTCh. 6 - Prob. 17CTCh. 6 - Prob. 18CTCh. 6 - Prob. 19CTCh. 6 - Prob. 20CTCh. 6 - Prob. 21CTCh. 6 - Prob. 1CCSRCh. 6 - Prob. 2CCSRCh. 6 - Prob. 3CCSRCh. 6 - Prob. 4CCSRCh. 6 - Prob. 5CCSRCh. 6 - Prob. 6CCSRCh. 6 - Prob. 7CCSRCh. 6 - Prob. 8CCSRCh. 6 - Prob. 9CCSRCh. 6 - Prob. 10CCSRCh. 6 - Prob. 11CCSRCh. 6 - Prob. 12CCSRCh. 6 - Prob. 13CCSRCh. 6 - Prob. 14CCSRCh. 6 - Prob. 15CCSRCh. 6 - Prob. 16CCSRCh. 6 - Prob. 17CCSRCh. 6 - Prob. 18CCSRCh. 6 - Prob. 19CCSRCh. 6 - Prob. 20CCSRCh. 6 - Prob. 21CCSRCh. 6 - Prob. 22CCSRCh. 6 - Prob. 23CCSRCh. 6 - Prob. 24CCSRCh. 6 - Prob. 25CCSRCh. 6 - Prob. 26CCSRCh. 6 - Prob. 27CCSRCh. 6 - Prob. 28CCSR
Additional Math Textbook Solutions
Find more solutions based on key concepts
TRY IT YOURSELF 1
Find the mean of the points scored by the 51 winning teams listed on page 39.
Elementary Statistics: Picturing the World (7th Edition)
Answer the following regarding the English alphabet. a. Determine the ratio of vowels to consonants. b. What is...
A Problem Solving Approach To Mathematics For Elementary School Teachers (13th Edition)
Choose one of the answers in each case. In statistical inference, measurements are made on a (sample or popula...
Introductory Statistics
Balloons A spherical balloon is inflated and its volume increases at a rate of 15 in3/min. What is the rate of ...
Calculus: Early Transcendentals (2nd Edition)
15. Smartphones Based on an LG smartphone survey, assume that 51% of adults with smartphones use them in theate...
Elementary Statistics (13th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, algebra and related others by exploring similar questions and additional content below.Similar questions
- موضوع الدرس Prove that Determine the following groups Homz(QZ) Hom = (Q13,Z) Homz(Q), Hom/z/nZ, Qt for neN- (2) Every factor group of adivisible group is divisble. • If R is a Skew ficald (aring with identity and each non Zero element is invertible then every R-module is free.arrow_forwardI have ai answers but incorrectarrow_forwardwhat is the slope of the linear equation-5x+2y-10=0arrow_forward
- ************* ********************************* Q.1) Classify the following statements as a true or false statements: a. If M is a module, then every proper submodule of M is contained in a maximal submodule of M. b. The sum of a finite family of small submodules of a module M is small in M. c. Zz is directly indecomposable. d. An epimorphism a: M→ N is called solit iff Ker(a) is a direct summand in M. e. The Z-module has two composition series. Z 6Z f. Zz does not have a composition series. g. Any finitely generated module is a free module. h. If O→A MW→ 0 is short exact sequence then f is epimorphism. i. If f is a homomorphism then f-1 is also a homomorphism. Maximal C≤A if and only if is simple. Sup Q.4) Give an example and explain your claim in each case: Monomorphism not split. b) A finite free module. c) Semisimple module. d) A small submodule A of a module N and a homomorphism op: MN, but (A) is not small in M.arrow_forwardI need diagram with solutionsarrow_forwardT. Determine the least common denominator and the domain for the 2x-3 10 problem: + x²+6x+8 x²+x-12 3 2x 2. Add: + Simplify and 5x+10 x²-2x-8 state the domain. 7 3. Add/Subtract: x+2 1 + x+6 2x+2 4 Simplify and state the domain. x+1 4 4. Subtract: - Simplify 3x-3 x²-3x+2 and state the domain. 1 15 3x-5 5. Add/Subtract: + 2 2x-14 x²-7x Simplify and state the domain.arrow_forward
- Q.1) Classify the following statements as a true or false statements: Q a. A simple ring R is simple as a right R-module. b. Every ideal of ZZ is small ideal. very den to is lovaginz c. A nontrivial direct summand of a module cannot be large or small submodule. d. The sum of a finite family of small submodules of a module M is small in M. e. The direct product of a finite family of projective modules is projective f. The sum of a finite family of large submodules of a module M is large in M. g. Zz contains no minimal submodules. h. Qz has no minimal and no maximal submodules. i. Every divisible Z-module is injective. j. Every projective module is a free module. a homomorp cements Q.4) Give an example and explain your claim in each case: a) A module M which has a largest proper submodule, is directly indecomposable. b) A free subset of a module. c) A finite free module. d) A module contains no a direct summand. e) A short split exact sequence of modules.arrow_forwardListen ANALYZING RELATIONSHIPS Describe the x-values for which (a) f is increasing or decreasing, (b) f(x) > 0 and (c) f(x) <0. y Af -2 1 2 4x a. The function is increasing when and decreasing whenarrow_forwardBy forming the augmented matrix corresponding to this system of equations and usingGaussian elimination, find the values of t and u that imply the system:(i) is inconsistent.(ii) has infinitely many solutions.(iii) has a unique solutiona=2 b=1arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
Recommended textbooks for you
- Algebra and Trigonometry (6th Edition)AlgebraISBN:9780134463216Author:Robert F. BlitzerPublisher:PEARSONContemporary Abstract AlgebraAlgebraISBN:9781305657960Author:Joseph GallianPublisher:Cengage LearningLinear Algebra: A Modern IntroductionAlgebraISBN:9781285463247Author:David PoolePublisher:Cengage Learning
- Algebra And Trigonometry (11th Edition)AlgebraISBN:9780135163078Author:Michael SullivanPublisher:PEARSONIntroduction to Linear Algebra, Fifth EditionAlgebraISBN:9780980232776Author:Gilbert StrangPublisher:Wellesley-Cambridge PressCollege Algebra (Collegiate Math)AlgebraISBN:9780077836344Author:Julie Miller, Donna GerkenPublisher:McGraw-Hill Education
Algebra and Trigonometry (6th Edition)
Algebra
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:PEARSON
Contemporary Abstract Algebra
Algebra
ISBN:9781305657960
Author:Joseph Gallian
Publisher:Cengage Learning
Linear Algebra: A Modern Introduction
Algebra
ISBN:9781285463247
Author:David Poole
Publisher:Cengage Learning
Algebra And Trigonometry (11th Edition)
Algebra
ISBN:9780135163078
Author:Michael Sullivan
Publisher:PEARSON
Introduction to Linear Algebra, Fifth Edition
Algebra
ISBN:9780980232776
Author:Gilbert Strang
Publisher:Wellesley-Cambridge Press
College Algebra (Collegiate Math)
Algebra
ISBN:9780077836344
Author:Julie Miller, Donna Gerken
Publisher:McGraw-Hill Education
Matrix Factorization - Numberphile; Author: Numberphile;https://www.youtube.com/watch?v=wTUSz-HSaBg;License: Standard YouTube License, CC-BY