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5 October, 14:20

Using substitution how do you solve - 4x+y=6 - 5x-y=21

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  1. 5 October, 14:30
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    -4x+y=6

    y=4x+6

    -x=3

    y=4 (-3) + 6

    y=-6

    therefore, y=-6, x=-3
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