Solve the System of Equations Using Substitution $$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 61 \\x - y = 1\end{array} \right.$$

question 42

Multiple Choice

Solve the system of equations using substitution.
- $$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 61 \\x - y = 1\end{array} \right.$$

• A) x = 4, y = 5; x = 5, y = 4
• B) x = 4, y = -5; x = 5, y = -4
• C) x = -4, y = -5; x = 5, y = 4
• D) x = -4, y = 5; x = -5, y = 4

---

Definitions:

Income Elasticity

A measure of how the demand for a good or service changes in relation to a change in income.

Good

A tangible product that satisfies human wants or needs.

Service

An (intangible) act or use for which a consumer, firm, or government is willing to pay.

Cross Elasticity

A measure of how the quantity demanded of one good responds to a change in the price of another good, indicating the relationship between goods as substitutes or complements.