Solve the System $$\left\{ \begin{aligned}x ^ { 2 } + 5 y ^ { 2 } & = 42 \\y & = x\end{aligned} \right.$$

question 33

Multiple Choice

Solve the system.
- $$\left\{ \begin{aligned}x ^ { 2 } + 5 y ^ { 2 } & = 42 \\y & = x\end{aligned} \right.$$

• A) \(\{ ( \sqrt { 7 } , \sqrt { 7 } ) \}\)
• B) \(\{ ( \sqrt { 7 } , - \sqrt { 7 } ) , ( - \sqrt { 7 } , \sqrt { 7 } ) \}\)
• C) \(\{ ( \sqrt { 7 } , \sqrt { 7 } ) , ( - \sqrt { 7 } , - \sqrt { 7 } ) \}\)
• D) \(\{ ( \sqrt { 7 } , - \sqrt { 7 } ) \}\)

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