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4 April, 20:05

Solve by substitution 2x+4y = - 2 and y = 4x - 5

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Answers (2)
  1. 4 April, 20:18
    0
    2x + 4 (4x - 5) = - 2

    2x + 16x - 20 = - 2

    18x - 20 + 20 = - 2 + 20

    18x = 18

    18x/18 = 18/18

    x = 1

    y = 4 (1) - 5

    y = 4 - 5

    y = - 1
  2. 4 April, 20:27
    0
    2x+4 (4x-5) = - 2 2x+16x-20=-2 18x-20=-2 + 20 + 20 18x=18 18x/18 = x. 18/18=1. so x=1
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