Condition for Parallel Lines

Q.

Which of these pairs of lines are parallel?

1. y = 3; 2x - 7y - 5 = 0

2. 3y - 2x = 2; 3x - 2y = 2

3. $\frac{x}{3}+\frac{y}{2}=1;x+\frac{3y}{2}=3$

4. $\sqrt{3}x-y=2;\sqrt{6}x-\sqrt{2}y=2$