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5 February, 08:37

5x+6y=13; -5x+2y=11. how do I solve this

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  1. 5 February, 08:57
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    You solve for X in one equation and plug it into the other. So ...

    5x+6Y=13

    5x=13-6Y

    x = (13-6Y) / 5

    Then, you replace X in the other equation ...

    -5x+2y=11

    -5[ (13-6y) / 5]+2y=11

    -13+6y+2y=11

    8y=11+13

    8y=24

    y=3

    Now that you have Y, you just solve for x using either equations ...

    5x+6 (3) = 13

    5x=13-18

    5x=-5

    x=-1

    Therefore, X = - 1 & Y = 3
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