Which set of ordered pairs represents a direct relationship between the x and y values?

Question

A-(0, 0), (1, 2), (2, 4)
B-(0, 0), (1, 2), (3, 4)
C-(0, 0), (1, 2), (2, 1)
D-(0, 0), (1, 2), (3, 9)

Answer 1

Direct variation means that  y = k*x  for some constant k  

 

Can you find which set of ordered pairs have this property?