When two variables are related in such a way that the ratio of their values always remains the same, the two variables are said to be in direct variation.
y=2x is direct variation
y=x+2 is not direct variation
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find the direct variation equation 3x+y=0
Without the rest of the equation it is not possible to tell. * * * * * If the equation is in the form y = k*x where k is a non-zero constant, then it is.
no. It must be an equation of the form y = kx.
Oh, dude, direct variation is when two variables change in the same way. In this case, 5x + 3 = 8y + 3, so technically they are changing in the same way by adding 3 to both sides. So, yeah, I guess you could say it's a direct variation, but like, who really cares, right?
Direct variation is not a special case.