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Solve the system of linear equations by substitution.

-x-8=-y

9y-12+3x=0

The solution is (,)

+3
Answers (2)
  1. 3 April, 04:11
    0
    The solution (x, y) = (-5, 3)

    Step-by-step explanation:

    -x - 8 = - y ... (1)

    9y - 12 + 3x = 0 ... (2)

    from equation (1)

    -x = - y + 8 ... (3)

    multiply equation (3) by - 1

    x = y - 8 ... (4)

    substituting equation (4) in equation (2)

    9y - 12 + 3 (y - 8) = 0

    9y - 12 + 3y - 24 = 0

    12y - 36 = 0

    12y = 36

    y = 36 / 12

    y = 3

    Substitute y = 3 in equation (4)

    x = y - 8

    x = 3 - 8

    x = - 5
  2. 3 April, 04:30
    0
    -X-8+8=-y+8

    -x = - 8y

    X=8y
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