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30 September, 08:16

What is - 4x+y=6 and - 5x-y=21 in subsitution

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  1. 30 September, 08:22
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    Solve for y in the first equation.

    y = 4x + 6

    Substitute 4x + 6 into the second equation.

    -5x - (4x + 6) = 21

    Distribute

    -5x - 4x - 6 = 21

    Combine like terms

    -9x = 27

    Divide both sides by - 9

    x = - 3

    Substitute back into first equation

    -4 (-3) + y = 6

    Solve for y

    y = - 6
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