For what number of aerobics classes will the cost for members and nonmembers be the​ same?

Question

At a local fitness​ center, members pay a $10 membership fee and

$3 for each aerobics class. Nonmembers pay $4 for each aerobics class. For what number of aerobics classes will the cost for members and nonmembers be the​ same?

Answer 1

C= 10 + 3A

C = 4A

set the costs equal

10+3A = 4A

A = 10 classes when the costs are the same, $40 for members, $40 for non-members