At the end of every month Michael deposits $70 into his savings account. After 11 months, Michaelâ€™s account had a total of $1250. Which of these equations expresses the amount y Michael has in his savings account after x months?

a. Y=70x b. Y-11=70(x-1250) c. Y-1250=70(x-11) d. Y-70x+1250

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Since Michael put in 70*11 dollars after 11 months and had 1250 in his account, that must mean had 1250-70*11 dollars in his account initially. He originally had 480 dollars, then added 70 dollars for x months. This equation is y=480+70x

The correct answer is c, as it is the only equation that, when expanded, equals y=480+70x

Y-1250=70(x-11)

Y=70x-770+1250

Y=480+70x

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