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4 January, 13:44

Solve x + 3y = 9

3x - 3y = - 13

+3
Answers (2)
  1. 4 January, 13:53
    0
    x = - 1

    y = 3.33

    Step-by-step explanation:

    Isolate one term from either equation.

    W'ell isolate x from the first equation.

    x + 3y = 9

    Rearrange:

    x = 9 - 3y

    Substitute this value for x into the second equation.

    3x - 3y = - 13

    3 (9 - 3y) - 3y = - 13

    27 - 9y - 3y = - 13

    -12y = - 40

    y = 10/3 = 3.33

    Substitute this value for y into the original equation.

    x + 3 * (3.33) = 9

    x = - 1

    Substitute both values into second equation to check.

    3 (-1) - 3 (3.33) = - 13

    Therefore, x = - 1

    and y = 3.33 (or 10/3)
  2. 4 January, 14:11
    0
    The answer is X = - 1 and Y = 3.33
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