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16 May, 03:28

Solve the equations by elimination.

-7x-8y=9

-4x+9y=-22

+4
Answers (1)
  1. 16 May, 05:51
    0
    Solve for x in - 7x - 8y = 9

    x = - 9 + 8y/7

    Substitute x = - 9 + 8y/7 into - 4x + 9y = - 22

    4 (9 + 8y) / 7 + 9y = - 22

    Solve for y in 4 (9 + 8y) / 7 + 9y = - 22

    y = - 2

    Substitute y = - 2 into x = - 9 + 8y/7

    x = 1

    Thus,

    x = 1

    y = - 2
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