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26 January, 20:12

3x-4y=18 x 3y=-7 how do i solve this

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  1. 26 January, 21:00
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    3 times (2) gives 3x + 9y = - 21 (3)

    (3) - (1) gives 13y = - 39

    y = - 3

    Sub. y=-3 into (2)

    x + - 9 = - 7

    x = 2

    Answer = (2,-3)
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