Answer: A - one solution, B - Infinite solutions, C - no solutions
Explanation:
Solutions of linear equations are any points at which both lines intersect. The point of intersection provides a point that lies on both lines and satisfies both equations - hence why it is called a "solution" to the system of equations.
In the first diagram, the lines intersect once. There is only one solution to this system of equations at (2, 4).
In the second diagram, the lines are identical. They intersect for any possible value, meaning it has infinite solutions.
In the third diagram, the lines are parallel. They will stretch to infinity without ever intersecting each other, so this system has no solution.