Find the Solution to the System of Equations by Substitution $$\begin{array} { c } 7 x + y = 0 \\- 7 x + y = - 14\end{array}$$

question 37

Multiple Choice

Find the solution to the system of equations by substitution.
- $$\begin{array} { c } 7 x + y = 0 \\- 7 x + y = - 14\end{array}$$

• A)(1, 14)
• B)(-1, 7)
• C)(1, -7)
• D)(-1, -7)

---

Definitions:

Random Assignment

The process of allocating individuals randomly to groups in an experimental study to ensure that each group is similar at the start of the study, reducing bias and increasing the validity of the results.

Positive Correlation

A connection between two variables wherein a rise in one leads to a rise in the other.

Experimental Group

In an experiment, the group that is exposed to an independent variable.

Participant Effect

The influence on research outcomes resulting from participants' awareness they are being studied, potentially altering their behavior.