Solve the System A) $\{ ( 4,5 , - 2 ) \}$

question 101

Multiple Choice

Solve the system.
- $$\begin{array} { l } \frac { 1 } { x } + \frac { 1 } { y } + \frac { 1 } { z } = \frac { 19 } { 20 } \\\frac { 1 } { x } - \frac { 1 } { y } - \frac { 7 } { z } = - \frac { 69 } { 20 } \\\frac { 9 } { x } + \frac { 1 } { y } + \frac { 1 } { z } = \frac { 59 } { 20 }\end{array}$$

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

---

Definitions:

Cost Behaviour

Cost behavior is the manner in which a cost changes as the related activity level or volume changes, typically classified into fixed, variable, and mixed costs.

Cost Estimation

The process of forecasting the likely costs of a project or production, based on various factors and historical data.

Data Collection

The process of gathering and measuring information on variables of interest, in an established systematic fashion that enables one to answer stated research questions, test hypotheses, and evaluate outcomes.

Activity Based Costing

A costing method that assigns costs to products or services based on the resources they consume and the activities they require.