(2) parallel;

(3) coincidence;

2. Parallel when 2.a = 3 and c is not equal to -2; An intersection that is not equal to 3; Vertical when a =-4/3.

3. The intersection when m is not equal to -7 and m is not equal to-1; Parallel when m=-7, coincident when m=- 1, vertical when m =-13.

4.