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Mathematics 18 Online
OpenStudy (anonymous):

If y varies directly as x, and y is 6 when x is 72, what is the value of y when x is 8?

OpenStudy (welshfella):

y varying directly as x means y = kx where k is some constant

OpenStudy (welshfella):

you can find the value of k if you know the values of x and y which we do in this case y = 6 when x = 72 so substituting in y = kx 6 = k * 72 solve this for k

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