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30 April, 09:28

3x + 3y = - 9

3x - 3y = 21

+2
Answers (2)
  1. 30 April, 11:40
    0
    So solving by addition!

    6x = 12

    x = 2

    and y = - 5
  2. 30 April, 11:52
    0
    3x+3y=-9

    Add - 3y to both sides. 3x + 3y + - 3y = - 9 + - 3y 3x = - 3y - 9

    you can divide

    3x/3 = - 3y-9/3

    x = - y-3

    3x-3y=21

    x=y+7
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