To determine which letter represents the point (-7, -10), you would need to refer to a visual representation, such as a graph or coordinate plane, that shows the letters corresponding to specific coordinates. Since I do not have the visual context or graph to reference, I can't determine which letter corresponds to the point (-7, -10).
If you can provide a description of the graph or the coordinates associated with each letter, I can help you identify which letter corresponds to that point.