The first coordinate is the horizontal distance from the vertical axis.
The second coordinate is the vertical distance from the horizontal axis.
The point (-2, -3) represents the point at the extreme lower left of the line shown on the graph. Of the given points, it is the only one on the line.
(-2, -3) is on the graph
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We cannot say anything about whether it is a solution to the equation because no equation is given and no description is provided for the graph.