The given graph contains a line
The general equation of the line is

By observing the graph, we get two points which lie on the line
that are (0,3) and (-4,0)
Substitute x=0 and y=3 in the equation of the line, we get


Substitute x=-4 and y=0 in the equation of the line, we get


Substitute b=3, we get

Transferring 4 to the right-hand side, we get

By substituting b=3 and m=3/4 in the equation of the line, we get

We get the equation of the given line.
By giving many values to x, we will get many values for y.
Hence this graph has infinite solutions.