Find an Equivalent Equation in Rectangular Coordinates $$r ( \cos \theta - \sin \theta ) = 5$$

Multiple Choice

Find an equivalent equation in rectangular coordinates.
- $$r ( \cos \theta - \sin \theta ) = 5$$

A) $x + y = 5$
B) $x - y = 5$
C) $x - y = 25$
D) $\sqrt { x ^ { 2 } + y ^ { 2 } } ( x - y ) = 5$