Which of the following pairs of equations represents lines that are parallel? 
A y = 5 - 2x and y = 5 + 2x

B y = 5 - 2x and y = 5 + ½ x

C y = ½x + 5 and y = 2x + 5

D y = 2 - 5x and y = ½ - 5x​