Question

What is the solution set of y = x2 + 2x + 7 and y = x + 7?

Answer 1

The correct answer is 
y=x²+2x+7
y=x+7

==>x²+2x+7=x+7
==>x²+x=0
==>x(x+1)=0
==>(x=0 and y=7) or (x=-1 and y=-1+7=6)

Sol={(0,7),(-1,6)}

Hope this helps!