Mrs. Long bought pens and pencils at Staples. • Packages of pens cost $3 each. • Packages of pencils cost $2 each. • Mrs. Long bought a total of 10 packages of pencils and pens. • Mrs. Long spent $27.00 on the supplies. Which system of equations best represents this situation? Let "x" = the number of packages of pens. Let "y" = the number of packages of pencils. x +y = 10 A 2x + 3y = 27 %3D x +y = 10 B 3x + 2y = 27 %3D x-y = 10 2x + 3y = 27 %3D x - y = 10 3x + 2y = 27 %3D
Percentage
A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.
Algebraic Expressions
In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.
Numbers
Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.
Subtraction
Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.
Addition
Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.
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