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31 March, 12:00

3x-y=16

2x-y=12

substitution method

+2
Answers (2)
  1. 31 March, 12:37
    0
    Multiply 2nd equation by - 1 and add to first one

    3x-y=16

    -2x+y=-12 +

    1x+0y=4

    x=4

    sub back

    2x-y=12

    2 (4) - y=12

    8-y=12

    minus 8 both sides

    -y=4

    times - 1

    y=-4

    (x, y)

    (4,-4)
  2. 31 March, 13:01
    0
    The answer should be (4, - 4)
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