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3 March, 00:35

3. 2x - y = - 7

4x - y = - 4

A) (-1.5, 4)

B) (1.5, 10)

C) (4, - 1.5)

D) (-1.5, - 2)

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Answers (1)
  1. 3 March, 00:45
    0
    Multiply first equaton by - 1 and add to first

    -2x+y=7

    4x-y=-4 +

    2x+0y=3

    2x=3

    divide 2

    x=3/2

    sub

    2x-y=-7

    2 (3/2) - y=-7

    3-y=-7

    minus 3

    -y=-10

    negative 1 times both sides

    y=10

    (3/2,10)

    (1.5,10)

    B is ansre
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