# How do you graph x^2 + y^2 = 1 ?

Probably you can recognize it as the equation of a circle with radius $r = 1$ and center at the origin, $\left(0 , 0\right)$:
The general equation of the circle of radius $r$ and center at $\left(h , k\right)$ is:
${\left(x - h\right)}^{2} + {\left(y - k\right)}^{2} = {r}^{2}$