Answer:
Suppose the complete equation is,
'A Game swap membership cost $20 and includes one game per month for $5 non-members get one game a month for $7.Explain how to use this information to decide whether to become a member'
Given,
The membership cost = $ 20,
one game price = $ 5,
So, the total cost for a member for x months( say y ) = membership cost + games price for x months
y = 20 + 5x ......(1)
For non member,
One game cost = 7,
So, the total cost for non member for x months, y = 7x ....(2)
By graphing lines (1) and (2),
we obtained that,
For 10 months non membership is better but after that membership is better.
Note : Graphing :
y = 20 + 5x passes through (0, 20) and (-4, 0)
y = 7x passes through (0, 0) and (1, 7)