It's hard to say, since we're having such a difficult time seeing the graph.
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The format for the axis needs amending.
There is a similar question which was answered as graph of real numbers. It could also be a graph of the line y=0, or a graph of the x-axis.
c
The graph of ax + by = c is a straight line going through the points (0, c/b) and (c/a, 0).
Graph any two numbers that add together and get -3. Like, (5,-8) (0,-3) and then draw a line through them.