Solve the following problem using substitution or elimination: To skate at Roller Heaven, each person must pay a monthly membership fee (m) and a fee for each session (f). In January, Art attended 5 sessions and paid $25 in all. In July, he attended 10 sessions, and he paid $40 in all. How much is the membership fee and how much are the session?

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(5,25) and (10,40) plot and find the slope. Then use the point slope formula

25=m+5f
40=m+10f
-25=-m-5f
15=5f
f=3
m=10

m + 5f = 25
m + 10f = 40
m = 25 - 5f
(25 - 5f) + 10f = 40
etc

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