The top half of a circle with center (-7, 8) and radius 9.
The whole circle is
(x -(-7))^2 +(y -8)^2 = 9^2
(x +7)^2 +(y -8)^2 = 9^2
The top half of the circle.
That is from y = 8 to y = 17
So,
(x +7)^2 = 9^2 -(y -8)^2
x +7 = +,-sqrt[9^2 -(y -8)^2]
x = +,-sqrt[9^2 -(y -8)^2] -7 ----------***
for only
8 <= y <= 17