Graph 1. Coincident lines
The graph shows two identical lines, then the system has infinitely many solutions.
Answer: Many solutions
Graph 2. Parallel lines
The two lines will never intersect because they are parallel. Therefore, the system has no solution.
Answer: No solution
Graph 3. Intersecting lines
The graph show two intersecting lines. Remember that the solution of the system is the intersection point both graphs. So, the system has one solution.
Answer: One solution