Use Matrices and Gauss-Jordan Elimination to Solve Systems
Solve the System

question 62

Multiple Choice

Use Matrices and Gauss-Jordan Elimination to Solve Systems
Solve the system of equations using matrices. Use Gauss-Jordan elimination.
- $$\begin{array} { r r } 6 x - 7 y - z = & 9 \\x + 4 y - 7 z = & - 12 \\- 2 x + y + z = & - 5\end{array}$$

• A) \(\{ ( 7,4,5 ) \}\)
• B) \(\{ ( 7,5,4 ) \}\)
• C) \(\{ ( - 7,4,14 ) \}\)
• D) \(\{ ( 14,4 , - 7 ) \}\)

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Definitions:

Variable Costs

Costs that vary in direct proportion to changes in the level of production or activity within a business.

Incremental Analysis

A decision-making technique used to determine the financial impact of different choices by comparing their costs and benefits.

Variable Cost

Expenses that fluctuate with production volume, such as direct materials and direct labor costs.

Fixed Expenses

Fixed expenses are recurring costs that do not fluctuate with changes in production level or sales volume, such as rent, salaries, and insurance.