Solve Nonlinear Systems by Substitution
- $$\begin{array} { l } x y = 90 \\x ^ { 2 } + y ^ { 2 } = 181\end{array}$$

Multiple Choice

Solve Nonlinear Systems By Substitution
- $$\begin{array} { l } x y = 90 \\x ^ { 2 } + y ^ { 2 } = 181\end{array}$$

A) $\{ ( 9,10 ) , ( - 9 , - 10 ) , ( 10,9 ) , ( - 10 , - 9 ) \}$
B) $\{ ( 9,10 ) , ( - 9 , - 10 ) , ( 9 , - 10 ) , ( - 9,10 ) \}$
C) $\{ ( 9,10 ) , ( 10,9 ) , ( 9 , - 10 ) , ( 10 , - 9 ) \}$
D) $\{ ( - 9 , - 10 ) , ( - 10 , - 9 ) , ( - 9,10 ) , ( - 10,9 ) \}$