Solve the System by the Addition Method $$\begin{aligned}x + 6 y & = 11 \\4 x + 5 y & = - 13\end{aligned}$$

question 69

Multiple Choice

Solve the system by the addition method.
- $$\begin{aligned}x + 6 y & = 11 \\4 x + 5 y & = - 13\end{aligned}$$

• A) \(\{ ( - 7,3 ) \}\)
• B) \(\{ ( - 8,4 ) \}\)
• C) \(\{ ( 7,4 ) \}\)
• D) \(\varnothing\)

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Definitions:

Chebysheff's Theorem

A statistical theorem stating that for any data set or distribution, no matter the shape, a minimum proportion of values must lie within a certain number of standard deviations from the mean.

Standard Deviation

A measure of the amount of variation or dispersion in a set of values, indicating how spread out the values are around the mean.

Sales Receipts

Documents that provide proof of a transaction between a buyer and a seller.

Geometric Mean

The geometric mean is a measure of central tendency that is calculated by taking the nth root of the product of n numbers, often used for rates and ratios.