Stephen is making curtains for several windows in his aunt's house. He determines that he needs 8.5 yards of fabric for each window. a. Write an equation to represent the number of yards of fabric needed given a certain number of windows. Answer y = 8.5x b. What is the rate of change in this situation? Answer

Step-by-step explanation:

Let denotes number of windows and denotes the number of yards of fabric needed.

Stephen is making curtains for several windows in his aunt's house. He determines that he needs 8.5 yards of fabric for each window.

a. Equation becomes

This answer is already given in question.

b. To find rate of change in this situation, find

Differentiate with respect to

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4