Find an expression for the function whose graph is the bottom half of the parabola x + (y - 9)2 = 0.

Question

y=?
some help would be appreciated!

Answer 1

y=9-(1/2)x

Answer 2

apparently that's not the answer =S

Answer 3

x+(y-9)² = 0
y=√x +9

For the bottom half, y<9
therefore
y=9-√x

Answer 4

technically the bottom half of the graph is given by 9-(sqrt of -x)