A direct variation function contains the points (2, 14) and (4, 28). Which equation represents the function?

y = x/14
y = x/7
y = 7x
y = 14x

Question

A direct variation function contains the points (2, 14) and (4, 28). Which equation represents the function?

y = x/14
y = x/7
y = 7x
y = 14x

anonymous · Answer

@dumbcow

dumbcow · Answer

2 times what is 14  ?

danjs · Answer

The general way the books tell you to solve these, is to use the direct variation thing

y = k*x     and use your points (x,y)  in there to figure out what k is.

anonymous · Answer

@dumbcow 7

danjs · Answer

(x,y) = (2,14),

x=2 and y=14

Put that into 

y = k*x

danjs · Answer

14 = k*2

k = 7

y = 7x

dumbcow · Answer

there you go ..... its multiplying by 7

danjs · Answer

That is the basic way to solve the direct variation problems, use

y = k*x            put a given point in, and find out what 'k' is