Question

How do you graph `x^2+y^2=16`?

Answer 1

This is simply a circle of radius `4`, centered at the origin `(0, 0)`.

Explanation:

The standard form for the equation of a circle is:

`(x-a)^2 + (y-b)^2 = c^2`

where the center of the circle is the point `(a, b)` and its radius is `c` units.

In this case `a` and `b` are both `0`, and `4^2=16`.