can you please help with this question

Question

The amount of water, y, that is needed to cook rice varies directly with the amount of uncooked rice, x, that is used. For every 1 cup of rice, 2 cups of water are needed. Which equation represents this situation?

1. a. y = 2x
2. Selected:b. y = 2x + 1This answer is incorrect.
3. c. y = -2x
4. d. x + y = 2

Answer 1

Why would you add 1?? The problem tells you that you need TWICE as much water as rice.

If you have 4 cups of rice, do you need 2(4) + 1 = 9 cups if water? Come on now.