Chapter Seven:  Graphs and Linear Equations

Take notes on the following topics.

Chapter Seven

Section 7.1

Section 7.2

Section 7.3

Section 7.4

Section 7.5

Section 7.6

Section 7.7

Section 7.8

Section 7.9

Section 7.10

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Section 7.9     Proofs

(Examples provided by Prentice Hall)

 

Example 1

Prove that the graph of an equation of the form x/a + b/y + 1 crosses the x-axis at (a, 0) and crosses the y-axis at (0, b). bx + ay = ab and ay = –bx + ab y = (-b/a)x + b The y-intercept is b; therefore, the line crosses the y-axis at the point (0, b). Set y = 0, giving x = a. The line crosses the x-axis at (a, 0).

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