Question

brainly moderator brainly stars answer this question no spam .​

Answer 1

Answer:

Hey Mate,

Step-by-step explanation:

→ x + y = -7

→ ( x + y ) ^2 = ( -7) ^2

→x^2 + y ^2 + 2xy = 7 ^2

→ x^2 + y ^2 - 7  ^2 = -2xy

→ y +7 = - x

→ (y+ 7)^2= ( -x )

→ y^2 + 7^2 + 2y7 = x ^2

→ y^2 + 7^2-x^2 = - 2 yz

→ 7^2 + x^2 -y^2 = -2x7

→ 1/-2xy +  1 / -2yz + 1 / 2xz

→ 1/2 ( 1/xy + 1/y z+ 1 /zx )

→ -1/2 ( 7 + x + y/ xyz )

→ -1/2 (x + y + z / xyz)

→ -1/2 ( 0/xyz) = 0

thank you

Answer 2

Answer:

i think the answer is 1/y²+7²-6y