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10 September, 05:25

Solve for x and y

-2x-y=-9

5x-2y=-9

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Answers (1)
  1. 10 September, 05:48
    0
    we use equation 1 first.

    -2x - y = - 9

    -y = - 9 + 2x

    y = 9 - 2x

    We substitute value of y in equation 2

    5x - 2 (9 - 2x) = - 9

    5x - 18 - 4x = - 9

    5x - 4x = - 9 + 18

    x = 18 - 9

    x = 9

    We now find the value of y

    -2x - y = - 9

    -2 (9) - y = - 9

    -18 - y = - 9

    -y = - 9 + 18

    y = 9 - 18

    y = - 9
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