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2 March, 00:11

Find the solution of - x+5y=-18 5x-9y=10

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  1. 2 March, 04:06
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    -x + 5y = - 18 so x = 5y + 18

    5x-9y=10

    substitute x = 5y + 18 into 5x - 9y = 10

    5x - 9y = 10

    5 (5y + 18) - 9y = 10

    25y + 90 - 9y = 10

    16y = - 80

    y = - 5

    x = 5y + 18

    x = 5 (-5) + 18

    x = - 25 + 18

    x = - 7

    answer

    (-7, - 5)
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