Determine whether y varies directly with x, If so, find the constant of variation k and write the equation.

X Y
6 24
18 72
54 216
162 648.

A. yes; k = 6; y =6x
B. no
C. yes; k = 4; y = 4x
D. yes; k = 3; y = 3x

2 answers

look at the 1st pair ... does it fit any of the answers

if so , check another pair to see if the relationship is consistent
It's C