Which Method Should Be Used to Solve the System? Explain $$\begin{array} { l } x ^ { 2 } - y ^ { 2 } = 4 \\x + 8 y = 9\end{array}$$

question 34

Essay

Which method should be used to solve the system? Explain your answer, including a description of the first step.
- $$\begin{array} { l } x ^ { 2 } - y ^ { 2 } = 4 \\x + 8 y = 9\end{array}$$

---

Definitions:

ICD-10-PCS

The International Classification of Diseases, Tenth Revision, Procedure Coding System; a medical classification used for coding healthcare procedures.

Case-Sensitive

Pertaining to a system where letters of the alphabet are distinguished as upper case and lower case for data entry or programming.

ICD-9-PCS

International Classification of Diseases, 9th Revision, Procedure Coding System; used for coding medical procedures in health records, billing, and insurance processing.

ICD-10-PCS

International Classification of Diseases, Tenth Revision, Procedure Coding System; a medical classification system used to code procedures in the hospital setting.