Solve the System by Elimination $$\begin{array} { c } 4 x + 7 y = 24 \\- 2 x + 2 y = - 12\end{array}$$

question 112

Multiple Choice

Solve the system by elimination.
- $$\begin{array} { c } 4 x + 7 y = 24 \\- 2 x + 2 y = - 12\end{array}$$

• A) \(\{ ( 6,0 ) \}\)
• B) \(\{ ( 6,1 ) \}\)
• C) \(\varnothing\)
• D) \(\{ ( 5,1 ) \}\)

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Definitions:

Mixed Cost

Mixed cost is an expense that has both fixed and variable components, meaning it changes with the level of activity but also incurs a base cost.

Least-squares Regression

A statistical method used to determine the line of best fit by minimizing the sum of squares of the errors between the observed and predicted values.

Variable Cost

Costs that change in proportion to the level of activity or production volume.

Relevant Range

Relevant Range is the span of activity volume in which the assumptions about fixed and variable cost behavior are valid.