Can you please check my answers?

Solve the system by the substitution method.

-12x-y=22

y=x^2+10

answer: {(-8,74), (-4,260)}

x+y=8

y=x^2-4x+4

answer: {(4,4), (-1,9)}

y=x-4

y^2=-16x

answer: {(-4,-8)}

x^2+y^2=41

x+y=9

answer: {(5,4),(4,5)}

Solve the system by the substitution method.

x^2+y^2=36

x^2-y^2=36

answer: {(6,0), (-6,0)}

7x^2+y^2=49

7x^2-y^2=49

answer:{(square root 7,0), (negative square root 7,0)}

x^2+y^2=4

4x^2+9y^2=36

answer: {(0,2),(0,-2)}

x^2-y^2=25

4x^2+25^2=100

answer: {(5,0), (-5,0)}