This is asking you to interpret the slope. In this case, the +20 is just a baseline number and irrelevant to the question. Your slope is 10 which means for every car washed, they gain $10.
This is asking you to interpret the slope. In this case, the +20 is just a baseline number and irrelevant to the question. Your slope is 10 which means for every car washed, they gain $10.
