Question

A phone company uses the equation y = 0.15x + 10 to find y, the monthly charge for a customer sending x text

messages. How many text messages are sent if the monthly charge is $77.50?

Answer 1

Hey!

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Solution:

77.50 = 0.15x + 10

77.50 - 10 + 0.15x + 10 - 10

67.50 = 0.15x

0.15x = 67.50

0.15x/0.15 = 67.50/0.015

x = 450

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Check:

77.50 = 0.15(450) + 10

77.50 = 67.50 + 10

77.50 = 77.50

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Answer:

450 text messages can be sent when the monthly charge is $77.50!

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Hope This Helped! Good Luck!