To represent a linear equation graphically:

1. Convert the equation to the form y=mx+c.
2. Find at least two points by substituting values for x and y calculating. 
3. Plot the points on a Cartesian plane.
4. Draw a straight line passing through the points.

• The lines intersect at a single point. In this case, the pair of equations has a unique solution.
• The parallel lines. In this case, the equations have no solution.
• The coincident lines. In this case, the equations have infinitely many solutions.