2. Which system has an infinite number of solutions?

a. x ÷ 2=y
4=2y - x

b. 2y ÷ 6 = 4x
-3 = y - 2x

c. y ÷ 3 = 2x
4x = 2y - 3

d. y = 2x - 5
-2 = y - 2x