Answer:
The same lines
Explanation:
The same lines will form a dependent system of equations.
This is because when two lines are coincident we have say lines as the same.
If the same line is of the form say
ax+by=c
THis time we can write (x,y) as y = (c-ax)/b
Thus solution would be
ordered pair

Thus dependent solution
But parallel lines do not have solution at all, while intersecting lines have unique solution.
So answer is same lines