Solve the System for X and Y Using Cramer's Rule $$\begin{array} { l } a x + y = \frac { 1 } { a } \\b x + y = \frac { 1 } { b }\end{array}$$

question 177

Multiple Choice

Solve the system for x and y using Cramer's rule. Assume a and b are nonzero constants.
- $$\begin{array} { l } a x + y = \frac { 1 } { a } \\b x + y = \frac { 1 } { b }\end{array}$$

• A) \(\left\{ \left( - \frac { 1 } { a b } , \frac { a + b } { a b } \right) \right\}\)
• B) \(\left\{ \left( \frac { 1 } { a b } , a + b \right) \right\}\)
• C) \(\left\{ \left( - \frac { 1 } { a b } , \frac { b - a } { a b } \right) \right\}\)
• D) \(\left\{ \left( \frac { 1 } { a b } , \frac { a - b } { a b } \right) \right\}\)

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Definitions:

Fixed Cost Element

A component of total costs that does not change with the level of output or activity within a certain range.

Fixed Cost

Costs that do not change with the level of manufacturing activity or output, such as rent, salaries, and insurance premiums.

Constant In Total

A term that refers to a cost or expense that remains unchanged in total, regardless of changes in the related level of activity or volume.

Break-Even Point

The level of activity at which total revenue equals total costs.