Answer:

Step-by-step explanation:
we have
-----> equation A
----> equation B
we know that
The solution of the system of equations is the point 
so
The solution of the equation
is equal to the x-coordinate of the solution of the system of equations
therefore
The solution is 
The equation of a circle:

(h, k) - a coordinates of the center
r - a radius

Answer: B. (–5, 7); 3
Answer:
so the answer would be 10b