Answer
Please see the graph.
Work Step by Step
$x^2+y^2=20$
If we let $y=0$, we have $x^2=20$.
$x^2=20$
$\sqrt {x^2} = \sqrt 20$
$x = ±\sqrt 20$
If we let $x=0$, we would have the same result for $y$. The four points on the circle are the intercepts.
