Answer:
y=x-4 and y=x+10
x=y+4 and x=y-10
Explanation:
I am unsure what 7-√ is, so I will assume the radius is 7. Since we know the equation of a circle is (x-h)^2+(y-k)^2=r^2 with h and k being the x and y coordinates of the circle respectively, we can then plug in the radius and other variables to our utmost ability, and solve it for fun.
(x-10)^2+(y+13)^2=49
x-10+y+13=+-7
Case 1:
x-10+y+13=7
y=x-4
x=y+4
Case 2:
x-10+y+13=-7
y=x+10
x=y-10