Answer:
(3,-7)
Step-by-step explanation:
Midpoint Formula
(3,-9) = ((3+x)/2 , (-11+x)/2)
Solve for x coordinate
[tex]3 = \frac{3 + x}{2} \\ 6 = 3 + x \\ 3 = x[/tex]
Solve for y coordinate
[tex] - 9 = \frac{ - 11 + x}{2} \\ - 18 = - 11 + x \\ - 7 = y[/tex]
Therefore point s is (3, -7)
