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18 June, 07:47

X+2y=4

-x-2y=-4

the solutions

+1
Answers (1)
  1. 18 June, 08:14
    0
    subtract equations to form the equation of:

    2x + 2y = 8

    rearrange first equation to make x the subject:

    x = 4 - 2y

    subsitute into 2x + 2y = 8

    2 (4 - 2y) + 2y = 8

    8 - 4y + 2y = 8

    collect like terns

    -2y + 8 = 8

    8s cancel out

    -2y = 0

    divide by - 2

    y = 0

    substitute y value into x + 2y = 4

    x + 2 (0) = 4

    solve for x

    x + 0 = 4

    x = 4

    therefore, the solutions are:

    x = - 4y = 0
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