Total cost of Silver Gym = 35 + 25N where N is the number of sessions
Total cost of Fit Factor = 75 + 15N
To find out when the costs are equal....set the equations equal
35 + 25N = 75 + 15N subtract 15N from both sides
35 + 10N = 75 subtract 35 from both sides
10N = 40 divide both sides by 10
N = 4 sessions
