algebra

solve the system by the elimination method
5x+5y=-7
7x-3y=19

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  1. Rewrite as:
    15x + 15y = -21 and
    35x - 15y = 57

    Now add them. The y terms cancel.
    50 x = 36
    x = 36/50 = 18/25

    (90/25) + 5y = -7 = -175/25
    5y = -265/25
    y = -53/25

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