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!
