Question

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

Answer 1

It is the equation of a circle:

Explanation:

Probably you can recognize it as the equation of a circle with radius `r=1` and center at the origin, `(0,0)`:

The general equation of the circle of radius `r` and center at `(h,k)` is:
`(x-h)^2+(y-k)^2=r^2`