Solve the System by the Substitution or Elimination Method $$\left( \begin{array} { r l } 2 x ^ { 2 } + y ^ { 2 } & = 15 \\x ^ { 2 } - y ^ { 2 } & = 6\end{array} \right)$$

question 185

Multiple Choice

Solve the system by the substitution or elimination method. $$\left( \begin{array} { r l } 2 x ^ { 2 } + y ^ { 2 } & = 15 \\x ^ { 2 } - y ^ { 2 } & = 6\end{array} \right)$$

• A) \(( \sqrt { 7 } , 1 ) , ( \sqrt { 7 } , - 1 ) , ( - \sqrt { 7 } , 1 ) , ( - \sqrt { 7 } , - 1 )\)
• B) \(( \sqrt { 7 } , 1 ) , ( \sqrt { 7 } , - 1 )\)
• C) \(( \sqrt { 8 } , 1 ) , ( \sqrt { 8 } , - 1 ) , ( - \sqrt { 8 } , 1 ) , ( - \sqrt { 8 } , - 1 )\)
• D) \(( - \sqrt { 8 } , 1 ) , ( - \sqrt { 8 } , - 1 )\)
• E) \(( - \sqrt { 7 } , 1 ) , ( - \sqrt { 7 } , - 1 )\)

Know the concept and calculation of a standard normal distribution.

Distinguish between continuous and discrete random variables.

Grasp the relationship between standard deviation values and the shape of a normal curve.

Understand the key figures and inventions that marked the late 19th century and their significance in the socio-economic context.

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