Simplify Complex Rational Expressions
- $$\begin{array} { r } x - 4 y + z = 15 \\y + 8 z = 11 \\z = 14\end{array}$$

question 90

Multiple Choice

Simplify Complex Rational Expressions
- $$\begin{array} { r } x - 4 y + z = 15 \\y + 8 z = 11 \\z = 14\end{array}$$

• A)
• \(\left[ \begin{array} { c c c | c } 1 & - 4 & 1 & 15 \\ 0 & 1 & 8 & 11 \\ 0 & 0 & 1 & 14 \end{array} \right]\)
• B)
• \(\left[ \begin{array} { c c | c | c } 0 & - 4 & 0 & 15 \\ 0 & 0 & 8 & 11 \\ 0 & 0 & 0 & 14 \end{array} \right]\)
• C)
• \[\left[ \begin{array} { l l l | l }
• 1 & 4 & 1 & 15 \\
• 0 & 1 & 8 & 11 \\
• 0 & 0 & 1 & 14\end{array} \right] \quad
• D)
• \left[ \begin{array} { r r r | r }
• 1 & - 4 & 1 & 15 \\
• 1 & 1 & 8 & 11 \\
• 1 & 1 & 14
• \end{array} \right]\]

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Definitions:

Operating Income

Earnings from a company's core business operations, excluding revenue and expenses from non-operating activities like investments.

Variable Costs

Costs that vary depending on a company’s level of activity.

Break-even Sales

The amount of revenue from sales needed to cover a company's fixed and variable costs, resulting in zero net income.

Unit Selling Price

The amount of money charged for each individual unit of a product or service sold.