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8 January, 22:26

3x-y=4

2x-3y=-9

Using substitution

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Answers (1)
  1. 8 January, 22:52
    0
    3x-y=4

    => y=3x-4

    2x-3y=-9

    2x-3 (3x-4) = - 9

    2x-9x+12=-9

    -7x=-9-12

    -7x=-21

    => x=21/7=3

    3x-y=4

    3*3-y=4

    9-y=4

    => y=5

    x=3, y=5
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