X = y - 8
Step by step
Y = x + 8
x + 8 = y
-8 -8
x = y - 8
The standard form of a circle is

where h and k are the center and x and y are the coordinates you're given. We need to solve for the radius to finish this off correctly. Filling in, we have

and

, giving us that

. Therefore, our equation is
0.71 x 22 is the expression that works, because 1 AUD = 0.71USD.