For the data in the table tell whether y varies directly with x if it does write an equation for the direct variation

x y
3 5.4
7 12.6
12 21.6

a. not a direct variation.
b. direct variation, y=1.8x
c. direct variation, y=4x
d. direct variation, y=5/9x

for the data in the table tell whether y varies directly with x if it does write an equation for the direct variation.

x y
-2 1
3 6
8 11

a. not a direct variation.
b. direct variation, y=x
c. direct variation, y=2x
d. direct variation, y=-2x