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