Show graphically that each one of the following systems of equations has infinitely many solutions:

Both pass through the same points and are coinciding.

11

12

Show graphically that each one of the following systems of equations has infinitely many solutions:

14

Show graphically that each one of the following systems of equations has infinitely many solutions:

15

Show graphically that each one of the following systems of equations is in-consistent (i.e. has no solution):