Respuesta :

replace y with x

you get
x^2+x^2=16
2x^2=16
divide both sides by 2
x^2=8
square root both sides
x=+/-2√2

there are 2 points of intersection which happen at [tex](-2\sqrt{2},-2\sqrt{2})[/tex] and [tex](2\sqrt{2},2\sqrt{2})[/tex]