## Precalculus: Mathematics for Calculus, 7th Edition

$y=\pm \sqrt {4-\dfrac {1}{2}x^{2}}$
$x^{2}+2y^{2}=8\Rightarrow 2y^{2}=8-x^{2}\Rightarrow y=\pm \sqrt {4-\dfrac {1}{2}x^{2}}$ Now we can graph this equation using graphing calculator as asked in question