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Solve the System {x2+5y2=42y=x\left\{ \begin{aligned}x ^ { 2 } + 5 y ^ { 2 } & = 42 \\y & = x\end{aligned} \right.

Question 33

Multiple Choice

Solve the system.
- {x2+5y2=42y=x\left\{ \begin{aligned}x ^ { 2 } + 5 y ^ { 2 } & = 42 \\y & = x\end{aligned} \right.


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

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