Question

Given the function y = 5x – 7, how does the y-value change as x increases by 1?
A.

The y-value decreases by 7.
B.

The y-value decreases by 2.
C.

The y-value increases by 12.
D.

The y-value increases by 5.

Answer 1

Well lets check...lets use x = 0

y = 5x - 7

y = 5(0) - 7

y = -7

Okay...now increase 'x' by 1...so we'll be using x = 1

y = 5x - 7

y = 5(1) - 7

y = 5 - 7

y = -2

so we went from -7 to -2...what happened?

Answer 2

decrease by 7

Answer 3

Not quite....-7 to -2 is a 5 unit increase right?



So y increases by 5