Solve the System of Equations by the Substitution Method $$\left\{ \begin{array} { r } x + y = 6 \\y = 2 x\end{array} \right.$$

question 61

Multiple Choice

Solve the system of equations by the substitution method.
- $$\left\{ \begin{array} { r } x + y = 6 \\y = 2 x\end{array} \right.$$

• A) \(( 2 , - 4 )\)
• B) \(( - 2,4 )\)
• C) \(( - 2 , - 4 )\)
• D) \(( 2,4 )\)

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Definitions:

Elastic Demand

A situation in which the demand for a product or service significantly changes in response to changes in price.

Quantity Demanded

The total amount of a good or service that consumers are willing and able to purchase at a specific price point.

Percentage Increase

A measure of how much a quantity has grown compared to its original number, expressed as a percentage.

Demand Curve

The demand curve is a graphical representation showing the relationship between the quantity of a good consumers are willing to buy and its price.