Which point could NOT be part of the direct variation y=4x?

A: (0,0)
B: (4,16)
C: (5,20)
D: (16,4)

Question

Which point could NOT be part of the direct variation y=4x? 

A: (0,0)
B: (4,16)
C: (5,20)
D: (16,4)

mathslover · Answer

Again, plug-in the values and find which doesn't satisfy the situation for y = 4x.

mathslover · Answer

for example : 
A) 0,0

here x= 0 and y=0

So, put in y = 4x

0 = 4(0)
0 = 0 

which is obviously true. So, A) can not be our answer.

Similarly do for other options and find the answer.

mathslover · Answer

jdccy01 did it help?

mathmale · Answer

If you'd make a table of values (x as independent variable and y = 4x as dependent variable, and then let x = 1, 2, 3, 4, etc.,  you'll see that every time x increases, y also increases.  This fact eliminates which of the four possible answer choices??