Question 142779
X^2+Y^2=117
4X+4Y=60
4X=60-4Y
X=60/4-4Y/4
X=15-Y
(15-Y)^2+Y^2=117
225-30Y+Y^2+Y^2=117
2Y62-30Y+225-117=0
2Y^2-30Y+108=0
2(Y^2-15Y+54)=0
2(Y-9)(Y-6)=0
Y-9=0
Y=9 ANSWER.
Y-6=0
Y=6 ANSWER.
PROOFS:
4*9+4*6=60
36=24=60
60=60
9^2+6^2=117
81+36=117
117=117