Help :D
A direct variation includes the point (-8, 2). Which is an equation of the direct variation?

y = x/-4
-8y = x + 2
2y = -8x
y = -4x

Question

Help :D 
A direct variation includes the point (-8, 2).  Which is an equation of the direct variation?
 	
	y = x/-4
	-8y = x + 2
	2y = -8x
	y = -4x

cicilybailey14 · Answer

@iGreen.

anonymous · Answer

The equation for a direct variation is:

y = kx

So which one's look like that?

cicilybailey14 · Answer

The last one y=-4x?

anonymous · Answer

Yes, and there's another one.

anonymous · Answer

But it isn't simplified.

cicilybailey14 · Answer

uhm? either the first or third...

anonymous · Answer

The first is an indirect variation..

anonymous · Answer

So it's the third..

anonymous · Answer

Actually, only one of these equations includes the point (-8, 2).

Let's try the first one:

y = x/-4

Plug in (-8, 2):

2 = -8/-4

Can you divide -8 / -4?

cicilybailey14 · Answer

yeah, sure!...2

anonymous · Answer

Yep, so that gives us 2 = 2, which is true..so what's our answer going to be?

cicilybailey14 · Answer

erm the third

anonymous · Answer

No, we just tested one of the options, which option was that?

anonymous · Answer

@Cicilybailey14 look above at my calculations..what equation do you see me using?