Could someone please answer my few questions? That'd be great! I'll give 20 points!!!

Is y=3.6x a direct variation? If it is, what is the Constant variation?

Is 8y=2x a direct variation? If it is, what is the Constant variation?

Look at the following graphs. Sorry I can't type in graphs very well.

1. Cans of food-- 2, 4, 6
Dinners made- 4, 8, 12
Direct Variation? Constant Variation?

2. X- 7, 8, 9
Y- 0.5, 1.2, 1.5
Direct Variation? Constant Variation?