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)}