A cell phone service provider offers a plan that charges
$30.35 per month and $0.05 per minute for phone calls. If a
person received a bill of $45.35 last month, how many
minutes of phone calls were they charged for?

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Answer:

They were charged 300 minutes of phone calls.

Step-by-step explanation:

$30.35 was the monthly charge for this service provider. Subtract that from the $45.35 which would leave $15. $15 divided by $.05 = 300. 300 minutes is your answer.

Y=0.05x + 30.35
Plug in $45.35 for y and solve for x(minutes)
43.35=0.05x + 30.35
X = 600 minutes