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11 August, 13:54

Solve the system of equations.

2x - y = 7

x + y = 2

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Answers (1)
  1. 11 August, 17:38
    0
    rearrange x + y = 2

    y=2-x

    sub y to 2x-y=7

    2x - (2-x) = 7

    solve for x

    2x-2+x = 7

    3x-2 = 7

    3x = 7+2

    3x = 9

    x = 3

    sub x = 3 to y = 2-x

    y = 2-3

    y = - 1

    check:

    2 (3) - (-1) = 7

    7=7

    3 + (-1) = 2

    2=2

    therefore x = 3, y = - 1
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