Answer
$x^2 + y^2 = 1$
See graph below.
Work Step by Step
The question asks for a graph of the polar equation and to convert the equation into rectangular coordinates
Given r = -1
The graph consists of all points of which the r-coordinate is 1, which is 2 units away from the origin. See graph below
To convert the equation into rectangular coordinates, the following equation can be used:
$x^2 + y^2 = r^2$
So $r = -1$
$r^2 = (-1)^2$
$r^2 = 1$
$x^2 + y^2 = 1$
