Question

Solve the system by the substitution method.
x^2 + y^2 = 113
x + y = 15

A. {( -8, 7), ( -7, 8)}
B. {( 8, -7), ( 7, -8)}
C. {( 8, 7), ( 7, 8)}
D. {( -8, -7), ( -7, -8)}

Answer 1

x+y = 15
x = 15- y
now put this value of x in first equation
x^2+y^2 = 113
putting the new value of x
(15-y)^2 +y^2 = 113
now just solve it and u will get 2 values of y.

Answer 2

would it be C?

Answer 3

i don't know .. i haven't solved.. did you solve this?

Answer 4

well just did and yes its C

Answer 5

Thank you very much!

Answer 6

you are most welcome..