Posted by Kenneth on Monday, December 1, 2008 at 9:10pm.
To find out if your answer is correct, differentiate it and see if you get the original back.
y = x^3
dy/dx = 3 x^2
now put that in d dy/dx - 3 y
x(3 x^2)- 3 x^3 = ?
3 x^3 - 3 x^3 = 0
sure enough it works
Well, here try getting all the y stuff on one side and all the x stuff on the other side (separating variables)
x dy/dx = 3 y
dy/y = 3 dx/x
integrate both sides
ln y = 3 ln x
but 3 ln x = ln x^3
so
ln y = ln x^3
so
y = x^3 will work.
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