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Math Help - Find the Value of k

  1. #1
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    Smile Find the Value of k

    If point (k,3k) lies on the graph of the equation
    3x + y = 12, what is the value of k?
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  2. #2
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    Quote Originally Posted by magentarita View Post
    If point (k,3k) lies on the graph of the equation
    3x + y = 12, what is the value of k?
    Solve 3(k) + (3k) = 12 for k.
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  3. #3
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    ok.....

    Quote Originally Posted by mr fantastic View Post
    Solve 3(k) + (3k) = 12 for k.
    How did you know what equation to use?
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  4. #4
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    Quote Originally Posted by magentarita View Post
    How did you know what equation to use?
    They give it to you!

    (k,3k) lies on the graph of the equation
    3x + y = 12,


    Substitute x = k and y = 3k into 3x + y = 12.
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  5. #5
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    ok....

    Quote Originally Posted by mr fantastic View Post
    They give it to you!



    Substitute x = k and y = 3k into 3x + y = 12.
    The point written as it is through me off a bit.

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