Solve a System of Linear Equations in Three Variables Using $$\begin{array} { l } 3 x + 7 z = 31 \\5 x + 3 y + 2 z = 34 \\- 9 x - 5 y \quad = - 44\end{array}$$

question 121

Multiple Choice

Solve a System of Linear Equations in Three Variables Using Cramer's Rule
- $$\begin{array} { l } 3 x + 7 z = 31 \\5 x + 3 y + 2 z = 34 \\- 9 x - 5 y \quad = - 44\end{array}$$

• A) \(\{ ( 1,7,4 ) \}\)
• B) \(\{ ( 7,4,7 ) \}\)
• C) \(\{ ( 1 , - 7 , - 4 ) \}\)
• D) \(\{ ( 2,5,4 ) \}\)

---

Definitions:

Fixed Costs

Costs that remain constant in total regardless of changes in the level of activity or volume of production, such as rent, salaries, and insurance.

Fixed Costs

Costs that do not change with the level of production or sales activities within a certain range.

Break-Even Point

The point at which the amount of goods produced or sold results in revenues that are exactly equal to the costs, leading to no profit or loss.