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4 February, 18:41

Solve the following system of equations: 5x + y = 9 3x + 2y = 4 (-2, 5) (1, 4) (2, - 1) (4, - 4)

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  1. 4 February, 20:42
    0
    Multiply first equation by 2:

    10x + 2y = 18

    Subtract the second equation from this so that the 2y terms cancel:

    10x - 3x = 18 - 4

    7x = 14

    x = 2

    Plug into first equation to find y:

    5 (2) + y = 9

    10 + y = 9

    y = - 1

    The answer is (2,-1)
  2. 4 February, 21:12
    0
    Plug each set in until both equations are correct. The answer is (2,-1)
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