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Math Help - Linear Equation help

  1. #1
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    Linear Equation help

    If two lines 6x-y=-5 and ax+2y= 7 are parallel, then a equals?

    Please help.
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  2. #2
    Lord of certain Rings
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    Quote Originally Posted by AltQQ View Post
    If two lines 6x-y=-5 and ax+2y= 7 are parallel, then a equals?

    Please help.
    Just remember that parallel lines have equal slopes
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  3. #3
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by AltQQ View Post
    If two lines 6x-y=-5 and ax+2y= 7 are parallel, then a equals?

    Please help.
    If 2 lines are parallel, then they must have the same slope. First rewrite the lines in slope-intercept form:

    y=6x-5
    y=-\frac{a}{2}x+\frac{7}{2}

    Thus, we can say that 6=-\frac{a}{2} \implies \color{red}\boxed{a=-12}.

    I hope this makes sense!!
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  4. #4
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    Omg thanks guys.
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