Solve Nonlinear Systems by Addition
Solve the System by the Addition

Multiple Choice

Solve Nonlinear Systems By Addition
Solve the system by the addition method.
- $$\begin{array} { l } x ^ { 2 } - y ^ { 2 } = 9 \\x ^ { 2 } + y ^ { 2 } = 51\end{array}$$

A) $\{ ( \sqrt { 30 } , \sqrt { 21 } ) , ( - \sqrt { 30 } , \sqrt { 21 } ) , ( \sqrt { 30 } , - \sqrt { 21 } ) , ( - \sqrt { 30 } , - \sqrt { 21 } ) \}$
B) $\{ ( 0,0 ) \}$
C) $\{ ( \sqrt { 30 } , \sqrt { 21 } ) , ( - \sqrt { 30 } , - \sqrt { 21 } ) \}$
D) $\{ ( \sqrt { 30 } , \sqrt { 21 } ) , ( - \sqrt { 30 } , \sqrt { 21 } ) \}$