Question 377413
1.{{{x^2+y^2=4}}}
2.{{{x^2-y^2=4}}}
Add the equations together,
{{{2x^2=8}}}
{{{x^2=4}}}
{{{highlight(x=0 +- 2)}}}
Then use either equation to solve for {{{y}}}.
{{{4+y^2=4}}}
{{{y^2=0}}}
{{{highlight(y=0)}}}