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Thread: Solve the linear system.

  1. #1
    Newbie Silverstaraptor's Avatar
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    Exclamation Solve the linear system.

    3x-y=-6
    x+y=2

    Please, I really need help. OMGGGZZZZ I NEED HELP NOW PPLLZZZ!!!!!!!
    (hehehe...I know i shouldn't say that...)
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  2. #2
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    Quote Originally Posted by Silverstaraptor View Post
    3x-y=-6
    x+y=2

    Please, I really need help. OMGGGZZZZ I NEED HELP NOW PPLLZZZ!!!!!!!
    (hehehe...I know i shouldn't say that...)

    $\displaystyle 3x - y = -6, (1)$

    $\displaystyle x + y = 2, (2)$


    $\displaystyle (1) + (2): 4x = -4 \implies x = -1$.


    Substitute back into $\displaystyle (2)$

    $\displaystyle -1 + y = 2$

    $\displaystyle y = 3$.


    Therefore, your solution is $\displaystyle (x, y) = (-1, 3)$.
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