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Most probably yes, but it is difficult to be sure.
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Is 3x plus y equals 6 a direct variation?
Yes
Is the problem y equals 3x a direct variation if so what is the constant of variation?
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
Is the equation 3x - 5 equals y an example of direct variation?
-2
Is the equation 3x-6y0 a direct variation?
Without an equality sign the given expression can't be considered to be an equation.
When two quantities form a direct variation what is it called?
A direct variation (!) or direct reelationship.
