Use Cramerʹs Rule to Solve the System of Equations $$\begin{array} { c } x + 3 y = - 21 \\- 2 x + 4 y = - 28\end{array}$$

Multiple Choice

Use Cramerʹs rule to solve the system of equations. If D = 0, use another method to determine the solution set.
- $$\begin{array} { c } x + 3 y = - 21 \\- 2 x + 4 y = - 28\end{array}$$

A) $\{ ( 0 , - 7 ) \}$
B) $\{ ( 1 , - 8 ) \}$
C) Cramer's rule does not apply since $D = 0 ; \varnothing$
D) $\{ ( 7,0 ) \}$