3. Consider the real Cartesian plane with the standard distance function, d = the square root of [(x2 - x1)? + (y2 - Yı)?). Determine a corresponding coordinate system for the line I given by y = 2x + 3 (that is, a function f:l --> R such that for any two points P and Q on l, f (x, y) = [f(Q) - f(P)|) Show all of your calculations. 4. If fis a coordinate system on a line l, determine whether or not each of the following functions is a coordinate system on l.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
Question
3. Consider the real Cartesian plane with the standard distance function,
d = the square root of [(x2 - X1)²+ (y2 - y1)²].
Determine a corresponding coordinate system for the line I given by y = 2x + 3 (that is, a function f:l --> R such that for any two points P and Q on l, f (x, y) = \f(Q) - f(P)|.) Show all of your calculations.
4. If fis a coordinate system on a line l, determine whether or not each of the following functions is a coordinate system on l.
a. g(P) = f(P) - 10
b. h(P) = 10f(P)
с. К(Р) %3D 10 - f(P)
d. r(P) = f(P) + the square root of 10
5. If P and Q are points and the Ruler Postulate is assumed to be true, prove the following.
а. РQ 2 0
b. PQ = 0 if and only if P = Q
c. PQ = QP
6. Determine whether each statement is true or false.
a. The Poincaré Incidence Plane is an example of a projective plane.
b. An incidence plane that is neither affine nor projective is hyperbolic.
c. Lines in a plane satisfying the Incidence Axiom and Ruler Postulate have an infinite number of points.
d. If the
Ruler Postulate is true, the
the Triangle Inequality.
SO
e. Assuming only the Incidence Axiom and Ruler Postulate, if lines l and m are both parallel to line n, then l is parallel to m.
Transcribed Image Text:3. Consider the real Cartesian plane with the standard distance function, d = the square root of [(x2 - X1)²+ (y2 - y1)²]. Determine a corresponding coordinate system for the line I given by y = 2x + 3 (that is, a function f:l --> R such that for any two points P and Q on l, f (x, y) = \f(Q) - f(P)|.) Show all of your calculations. 4. If fis a coordinate system on a line l, determine whether or not each of the following functions is a coordinate system on l. a. g(P) = f(P) - 10 b. h(P) = 10f(P) с. К(Р) %3D 10 - f(P) d. r(P) = f(P) + the square root of 10 5. If P and Q are points and the Ruler Postulate is assumed to be true, prove the following. а. РQ 2 0 b. PQ = 0 if and only if P = Q c. PQ = QP 6. Determine whether each statement is true or false. a. The Poincaré Incidence Plane is an example of a projective plane. b. An incidence plane that is neither affine nor projective is hyperbolic. c. Lines in a plane satisfying the Incidence Axiom and Ruler Postulate have an infinite number of points. d. If the Ruler Postulate is true, the the Triangle Inequality. SO e. Assuming only the Incidence Axiom and Ruler Postulate, if lines l and m are both parallel to line n, then l is parallel to m.
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