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8 February, 15:05

Use substitution to solve 3x+y=-3 y=x+5

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  1. 8 February, 18:20
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    3x + y = - 3

    y = x + 5

    - x + y = - x + x + 5

    -x + y = 5

    3x + y = - 3

    -x + y = 5

    3x + y = - 3

    3 * (-x + y) = 5

    3x + y = - 3

    -3x + 3y = 5

    4y = 2

    4y/4 = 2/4

    y = 1/2
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