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11 July, 19:27

What is 3x - y = - 4 2x - y = - 10

Using substitution

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Answers (2)
  1. 11 July, 21:36
    0
    3x-y=-4

    -y=-3x-4

    y=3x-4

    2

    2x-y=10

    2x - (3x-4) = 10

    2x-3x+4=10

    x=6

    2x-y=-10

    2 (6) - y=-10

    12-y=-10

    -y=-22

    y=22
  2. 11 July, 23:27
    0
    3x - y = - 4

    3x - (-10) = - 4 Substitute

    3x + 10 = - 4 Simplify

    3x = - 14 Separate numbers and variables

    x = - 14/3 Divide

    2x - y = - 10

    2x - (-10) = - 10 Substitute

    2x + 10 = - 10 Simplify

    2x = - 20 Separate numbers and variables

    x = - 10 Divide
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