SOLUTION: Can you solve this? A 5 minute overseas call cost $5.91 and a 10 minute call costs $10.86. The cost of the call and the length of the call have a linear relationship. Write the

Question 1007226: Can you solve this?
A 5 minute overseas call cost $5.91 and a 10 minute call costs $10.86. The cost of the call and the length of the call have a linear relationship. Write the equation that models the situation. How long can you talk on the phone if you have $12?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
A five-minute difference in the two calls results in an increase of
10.86 - 5.91 = $4.95
That means the company charges $4.95 / 5 = $.99 a minute.
The original five-minute call costs $4.95 plus another $.96. That's how they got $5.91 for its charge.
Thus the equation for this situation is (using C for cost and m for minutes)
C = .99m + .96
Now plug 12 in for C and get
12 = .99m + .96
m = 11.15 minutes...probably rounded to 11 minutes...
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