Solve the System for X and Y Using Cramerʹs Rule $$a x + y = \frac { 1 } { a }$$

Solve the system for x and y using Cramerʹs rule. Assume a and b are nonzero constants.
- $$a x + y = \frac { 1 } { a }$$
$$b x + y = \frac { 1 } { b }$$

A) $\left\{ \left( \frac { 1 } { a b } , \frac { a - b } { a b } \right) \right\}$
B) $\left\{ \left( \frac { 1 } { a b } , a + b \right) \right\}$
C) $\left\{ \left( - \frac { 1 } { a b } , \frac { a + b } { a b } \right) \right\}$
D) $\left\{ \left( - \frac { 1 } { a b } , \frac { b - a } { a b } \right) \right\}$