What is one of the solutions to the following system of equations?

y2 + x2 = 65
y + x = 7

a (8, −1)
b (1, 6)
c (6, 1)
d (9, −2)

(8,-1)

Step-by-step explanation:

Given :  

To Find: solution of given system of equations.

Solution:

Equation a :  

Equation b :  

Substitute the value of y from equation b in equation a

y from equation b : y = 7-x

Now substitute value of y in equation a

Thus equation a becomes:

⇒ x= -1 and x = 8

Now substitute values of x  in equation b to obtains values of y

⇒

for x = -1

⇒

⇒

⇒

Thus (x,y)=(-1,8)

For x =8

⇒

⇒

⇒

Thus (x,y)=(8,-1)

Hence Option A is the correct solution .

r and t.

both are 64 degrees.

step-by-step explanation: s