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3(10x-y)-5(x-y^2) need this solved asap

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.