Answer:
The circumcenter is located at point A(4.5,-3)
Explanation:
Plot points T(9,0), V(0,-6), and 0 (0,0) on the coordinate plane. You get the right triangle TVO with hypotenuse TV.
The circumcenter of the right triangle is the midpoint of the hypotenuse.
Find the midpoint of the hypotenuse:

Hence, the circumcenter is located at point A(4.5,-3)