The standard equation of a circle:

(h, k) - center
r - radius
We have:
(2, -8) → h = 2, k = -8
r = 9
Substitute:

The answer is to your problem is x = 3
Combine like terms first:
0.5x+12x=12.5x
12.5x=5
5/12.5 is the answer
Answer:
Step-by-step explanation:
place a point at (0,0)- the starting point
next point at (2,1) - in 2 minutes she is 1 block away
Next point (4,2)- in 4 minutes she will be 2 blocks away
Connect those 3 points
then place a point at (9, 2)- 5 minutes later she was still at the store
Connect points
Point at (11,1) and (12,0) and connect