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14 February, 11:07

A recreation center charges nonmembers $3 to use the pool and $5 to use the basketball courts. A person pays $42 to use the recreation facilities 12 times. How many times did the person use the pool?

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  1. 14 February, 11:31
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    Let x = times in the pool

    Let y = times in the basketball courts

    42=3x+5y

    x+y=12

    Therefore y = 12-x

    Subsitute for y

    42 = 3x + 5 (12-x)

    42 = 3x + 60 - 5x

    Subtract 60

    -18 = - 2x

    9 = x

    The person used the pool 9 times.
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