SOLUTION: linda's cell phone bill is bill is $30 per month plus 5 cents for every minute over 300 minutes. last month she paid $31 for her cell phone usage. how many minutes did she use?

Question 269837: linda's cell phone bill is bill is $30 per month plus 5 cents for every minute over 300 minutes. last month she paid $31 for her cell phone usage. how many minutes did she use?
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
The bill is

b = 31 so we get

distribute to get

combine like terms to get

subtract 15 to get

divide to get

She used 320 minutes
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