SOLUTION: I need some advice. Could someone please tell me if my answer is right? I don't need to show the problem, just the answer.

Question 193959: I need some advice. Could someone please tell me if my answer is right? I don't need to show the problem, just the answer. Media services charges $20 for a phone plus $30mth for it's cheapest plan. The equation c=30t+20 describes the total cost,c, of operating a Media Services phone for tmths. What is the total cost for 8 mths. of service? I got $260, is that right? Then the second part is what I'm not sure of. If a customer only has $90 available, how many mths of services can he or she recieve? I divided by 90 without the $20 it's 2.6 and then I added the $20 it's 2.8. Is this right and which way did they mean it? Than-x I appreciate it.
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Your answer to the first part is correct!
For the second part, you need to set the total cost, c = $90 then solve for t, thus...
Substitute c = 90
Subtract 20 from both sides.
Now divide both sides by 30.
so...

For $90 the customer can get 2 1/3 months of service.
Check:
Substitute t = 2 1/3

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