Posted by **Jo** on Tuesday, January 29, 2013 at 9:31pm.

Denise's cell phone plan is $29.95 per month plus $.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is $99.95. For how many minutes was she billed? Answer is 700 but what is the algebraic equation?

- Algebra Problem Solving -
**Reiny**, Tuesday, January 29, 2013 at 10:47pm
cost = .10(m-300) + 29.95 , where m is the number of minutes

so ....

.10(m-300) + 29.95 = 99.95

.1m - 30 = 70

.1m = 100

m = 100/.1 = 1000

She used 1000 minutes, but is only billed for any time over 300 minutes , look at (m-300) in the equation.

She was billed for 700 minutes

btw, the equation is only valid for m>300

if m<300

it would simply be

cost = 29.95

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