Rate of change

Question

Identify the rate of change (slope) and the vertical intercept

 

f(x) = 8 − 9x

 

if y = −15

 

1)Slope=??

 

2)Vertical intercept (x, y) =??

Answer 1

Hey Silvana - 

 

If f(x) = y = mx+b; 

the slope is m 

and the vertical intercept (or y-intercept) is b.

The vertical intercept is always (x,y) = (0, b), the x is always 0.

 

 

So in your problem you are given f(x) = 8-9x

 

So in front of the "x" is -9 which means your slope m = -9

Also you see the 8 which has no "x" so your vertical intercept (or y-intercept) is 8.

 

Thus your answer:

1) slope = -9

2.) vertical intercept (x,y) = (0, 8)

 

Best - David