At a theater, an adult movie ticket costs $10.00 and a child movie ticket costs $6.00. One day, the theater sold 910 tickets, for a total sale of $7,500. How many adult tickets did the theater sell?

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.