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7 November, 11:19

Find the solution of this system of equations.

Separate the x - and y-values with a comma.

x = - 8 + y

-9x + 6y = 9

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  1. 7 November, 13:29
    0
    x = - 8 + y

    -9x + 6y = 9

    substitute x = - 8 + y into - 9x + 6y = 9

    -9x + 6y = 9

    -9 (-8 + y) + 6y = 9

    72 - 9y + 6y = 9

    -3y = - 63

    y = 21

    x = - 8 + y

    x = - 8 + 21

    x = 13

    solution (13, 21)
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