Question

The cost of a family membership at a health club is 58$ per month plus a one-time 129$ start-up fee. If a family spent 651$, how many months is there membership?

Answer 1

Equation is: y=58x+129 where x is the total months and y is the total cost. 
651=58x+129
522=58x
x=9 months of membership

Answer 2

9 months.
$651 - $129 = $522
$522/$58 = 9