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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.

With a line that passes through (0,8) and (3,20)
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?

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Answered by GPT-5 mini AI
Let h be hours babysat and C the total cost. The line passes through (0,8) so the flat fee is \$8, and the slope is (20−8)/(3−0)=4, the hourly rate.

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