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The cost of a plumbing repair is given by the equation y=45x+30, where x is the number of hours the repair takes and y is the total cost in dollars.if a repair costs a total of $300 how manny hours did it take?

Select the correct answer below.

A.6
B.7
C. 7 1/3
D.10

Respuesta :

first you subtract the 30 from 300 and than 270/45 and your answer will be A. 6

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