Pennsylvania Keystone Test

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A plumber charges a flat fee of $50 for a service call, plus an additional $75 per hour of labor. This relationship is modeled by the function C(h) = 75h + 50, where C(h) is the total cost and h is the number of hours of labor. What do the slope and y-intercept represent in this context?

The slope is the flat fee, and the y-intercept is the hourly rate. The slope is the number of hours, and the y-intercept is the total cost. The slope is the hourly rate, and the y-intercept is the flat fee. The slope is the total cost, and the y-intercept is the number of hours.

Correct Answer:

The slope is the hourly rate, and the y-intercept is the flat fee.

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