Solve the System by Elimination $$\begin{array} { c } x + 3 y = - 15 \\- 3 x + 4 y = - 20\end{array}$$

question 1

Multiple Choice

Solve the system by elimination.
- $$\begin{array} { c } x + 3 y = - 15 \\- 3 x + 4 y = - 20\end{array}$$

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

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Scientific Method

A systematic process of inquiry involving observation, experimentation, and hypothesis testing to gather empirical evidence and establish facts.

Experimental Research

A systematic and scientific approach to research in which the researcher manipulates one or more variables to determine their effect on a certain outcome.

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A method of gathering data from a predefined group of respondents to gain information and insights on various topics of interest.

Comparative Historical Research

A methodology in social science that involves the study and comparison of historical events to understand societal trends and transformations.