Math

Solve using the elimination method
3x+11y=34.5
9x-7y=-16.5

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  1. Eq1: 3X + 11Y = 34.5.
    Eq2: 9X - 7Y = -16.5.
    Multiply Eq1 by 9 and Eq2 by -3:
    27X + 99Y = 310.5.
    -27X + 21Y = 49.5.
    Sum: 0 + 120Y = 360,
    Y = 3.
    In Eq1, substitute 3 for Y:
    3X + 11*3 = 34.5,
    3X = 34.5 - 33 =1.5,
    X = 0.5.

    Solution Set = (X,Y) = (0.5,3).

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    posted by Henry

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