Question

***Medal***
Which of the following does not represent a direct variation?

A: Xavier took 2 pictures with his digital camera and used 2.4 gigabytes . He took 8 more and used another 9.6 gigabytes.

B: (Graph one)

C: y = 6 + x

D: (Graph two)

Answer 1

Graph one

Answer 2

Graph two

Answer 3

A direct variation can always be put in the form \(y = kx\) where \(k\) is a constant. The graph of \(y = kx\) is a straight line. In a table, a given change in \(x\) always results in an identical change in \(y\). Do any of your answer choices not have these properties?