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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?
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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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