There are two plans. The first plan charges a monthly fee of 152 pesos. It charges 7 pesos per minute to use the phone. The second plan charges a monthly fee of 95 pesos. It charges 9 pesos per minute to use the phone. How many minutes per month do you need to use for the two plans to cost the same.?

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Answers

2015-02-15T15:12:16+08:00

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First equation:
M=152+7x
where m=monthly and x is per minute of use
second equation:
M=95+9x
where x is per minute use of phone and m=month.
Just substitute:
M=M
152+7x=95+9x
57=2x
x=28.5 or 28 minutes 30 seconds.

Substitute:
M=152+7(28.5)=351.5
M=95+9(28.5)=351.5

Therefore you need to use the phone for 28 minutes and 30 seconds to have the same amount of cost for plan 1 and 2. Hope this helps =)
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