Question 633170
3)Let's start with infinite number of solutions. The two equations are the same line. The equations are multiple of each other.

y=x+2
2y=2x+4
2)
equations with no solutions are parallel.
y=3 and y=4 are parallel horizontal lines with slope of zero.
1)
this is the type you usually find where the two lines cross.
However, I am going to give you perpendicular lines which don't fit the rule.
y=3 and x=3 are perpendicular but the slopes multiplied together don't equal -1 

x=3 is a vertical line.
y=3 is a horizontal line. 
y=3 has a slope of zero.
x=3 has an undefined slope since x never changes. Remember slope is the change in y over the change in x.