algebra

Find the variation constaant and an equation of variation where Y varies directly as X and Y = 72 hen X = 8

The variation constant is K = ?
The equation of variation is Y = ?

I think that K = 9 but not sure
I don't have a clue about the rest.

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  1. "Y varies directly as X" ----> y = kx

    but we are given x=8, y = 72
    72 = k(8)
    k = 9, so

    y = 9x

    all done!

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  2. Thank you, I thought I was on the right track but wasn't sure.

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  3. solution:

    y=kx
    72=k(8)
    72/8=k
    9=k

    so 9 is our constant...

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