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2x - 3y = - 4 if x + 3y = 7

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  1. 3 May, 09:31
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    Leave x alone on one side.

    x = 7 - 3y

    Substitute into equation

    2 (7 - 3y) - 3y = - 4

    Distribute

    14 - 6y - 3y = - 4

    Solve

    14 - 9y = - 4

    14 + 4 = 9y

    18 = 9y

    y = 18/9

    y = 2

    x = 1
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