Since the point (-1,-3) is 3 units from the x-axis, and since we know that 3-4-5 right triangles have a hypotenuse which is 5 units long, we draw two 3-4-5 right triangles by using the vertical 3-unit line as the vertical side and draw the horizontal side 4 units long, like these two cases: Answer: (3,0) and (-5,0) Edwin