From the graphs provided in the question
Graph 1
There is a point of intersection between the two lines at (-4, -2 )
Thus,
graph 1 is to C
Grap 2
The two lines are parallel and they do not intercept
Hence, there is no solution
Graph 2 is to A
Graph 3
The lines align on each other, there is an infinite number of solution
Hence, Graph 3 is to B
Graph 4
The lines intersect at the point (-2,-5)
Hence it has a solution
Graph 4 is to D
Graph 1-------------------------------C
Graph 2------------------------------A
Graph 3-----------------------------B
Graph 4-----------------------------D