Hi y'all anyone can help me with my math

Ineed with number 6 , explain how to get 1978

X2 + y 2 = 36 x + y = 6 solve the system of equations.

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)