Question 182548
1) One, None, or infinitely many
2)  One--two lines intersect each other at one point only
    None--two lines are parallel to each other (they have the same slope/rate of change)
    Infinitely Many--two lines intersect each other at all points (one line lies right on top of the other)
3)  One 
y-3x=7
3y+x=-8

none
y-3x=7
y-3x=-10

infinitely many
y-3x=7
2y-6x=14