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20 November, 10:15

Substitution for 4x+y=9 and y=-7

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Answers (2)
  1. 20 November, 10:54
    0
    4x + y = 9

    y = - 7

    Plug it in:

    4x - 7 = 9

    Add 7 to both sides:

    4x = 16

    Divide 4 to both sides:

    x = 4

    Plug this back into the equation:

    4x + y = 9

    4 (4) + y = 9

    16 + y = 9

    Subtract 16 to both sides:

    y = - 7

    So our solution is (4, - 7)
  2. 20 November, 11:23
    0
    {y=-7

    {4x+y=9 Substitute y.

    4x + (-7) = 9

    4x-7=9 / + 7

    4x=16 / : 4

    x=4

    Solution; (4; - 7)
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