I am having some trouble with Direct Variation.
How do I know if (y) varies with (x) in the following problems?

y=12x y=-5x y-6x=0

Question

I am having some trouble with Direct Variation.
How do I know if (y) varies with (x) in the following problems?

y=12x         y=-5x        y-6x=0

ganeshie8 · Answer

$y = kx$

y varies directly wid x, where k is a constant

ganeshie8 · Answer

all your given equations are of examples of direct variation, as they can be changed to $y = kx$

anonymous · Answer

So as long as the equation is y=kx (y) directly varies with (x)? @ganeshie8

ganeshie8 · Answer

yup !

ganeshie8 · Answer

k can be any real number, doesnt matter negative/positive

anonymous · Answer

@ganeshie8 Okay! Thank you so much!

ganeshie8 · Answer

y = kx

as x changes by something, y always changes by k times of x.

ganeshie8 · Answer

np :)

careful about below equation, 

y= kx + b

its not a direct variation