All i gotta say is keep it in your pants man
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If y varies directly as x and if x = 2 when y = 8 then k = 4.
If y varies directly as x then k = 2.
If in the real number universe, first k is to be >0, y=kx = exlog(k) the antiderivative of eax is eax/a so the antiderivative of Y is exlog(k) / log(k) = kx /log(k)
W = k (x/y)'k' is some constant number.
y=x^2 * k k=constant of proportionality OR y/x^2 = k