Question

Use the image to answer the question.

A line graph which shows X-axis ranging from 0 to 15 in increments of 5 and y-axis ranging from 0 to 30 in increments of 10.
▼Click for Long Desc
The points marked on the line are left parenthesis 0 comma 8 right parenthesis and left parenthesis 3 comma 20 right parenthesis.


Colin charges a flat fee for babysitting plus an hourly fee. His total cost is represented on the graph. How can you represent this situation algebraically?

(1 point)

Answer 1

Let x = hours and y = total cost. Slope = (20−8)/(3−0) = 4, y-intercept = 8.

Equation: y = 4x + 8 (or C(h) = 8 + 4h).