Yes, it is direct variation.
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The question is not clear. But if you want this in the form y=kx, then k must be 1.5
3x - y = 4 Get y by itself to see if it is the same as y = 3x - 4: 3x = 4 + y 3x - 4 = y Therefore, 3x - y = 4 is the equivalent of y = 3x - 4.
If: 3x+y = 4 and x+y = 0 Then: x = 2 and y = -2
y = 2 sin 3x y' = 2(sin 3x)'(3x)' y' = 2(cos 3x)(3) y' = 6 cos 3x
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