put ur equations in y = mx + b form and compare the slopes(m) and the y intercepts (b). Parallel lines will have the same slope but different y intercepts.
A) y = 2x + 4....slope is 2, y int is 4
B) 2y = x + 4
y = 1/2x + 2.....slope is 1/2 and y int is 2
C) 2x + 2y = 4
2y = -2x + 4
y = -x + 2.....slope is -1 and y int is 2
D) 2x - y = 4
-y = -2x + 4
y = 2x - 4....slope is 2 and y int is -4
ur parallel lines will have same slope and different y int.....so ur answer is A and D.
