A bicycle shop rents bicycles by the hour. It charges an equipment fee with every rental. The graph shows the cost of renting a bicycle for different periods of time.

Write a linear function in the form y = mx + b to represent the situation.

The first quadrant of a coordinate plane. The horizontal axis is labeled time in hours, and the vertical axis is labeled cost in dollars. A ray begins at the point (0, 10) and passes through the point (2, 40).
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y =
x +