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Q: Is y equals 3x direct variation?

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Yes

-2

y=3x is a direct variation in that y varies directly with x by a factor of 3. Any linear equation (a polynomial of degree 1, which is a polynomial equation with a highest exponent of 1), is a direct variation of y to x by some constant, and this constant is simply the coefficient of the "x" term. Other examples: y=(1/2)x is a direct variation, and the constant of variation is 1/2 y=-9x is a direct variation, and the constant of variation is -9

find the direct variation equation 3x+y=0

No, it is not a direct variation.

No.

y=7x

The question is not clear. But if you want this in the form y=kx, then k must be 1.5

1

No, this is an inverse variation.

Direct

No.

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