1. correct
2. if lines are parallel, they do not intersect , so no solutions. Answer B.
3.B -the lines will have the same slope, and the same y intersect (actually it is the same line, and one equation can be converted to another.
4. y=2x-4,
y =x+1
2x-4=x+1
x=5.
y=6, point of interception should be (5,6)