Answer:
infinitely many solutions
Explanation:
When the system of equations have different slopes and different y intercept then the system has only one solution (exactly one solution)
When the system of equations have same slopes and different y intercept then the lines are parallel and they have no solution
When the system of equations have same slopes and same y intercept then the lines are one above the other and they have infinite solutions
If the equations in a system of equations have the same slope and the same y-intercept then they have infinitely many solutions.