Solve the System by the Substitution Method $$\left\{ \begin{array} { l } x + y = - 7 \\x - y = 15\end{array} \right.$$

question 65

Multiple Choice

Solve the system by the substitution method.
- $$\left\{ \begin{array} { l } x + y = - 7 \\x - y = 15\end{array} \right.$$

• A) \(\varnothing\)
• B) \(\{ ( 4 , - 11 ) \}\)
• C) \(\{ ( x , y ) \mid x + y = - 7 \}\)
• D) \(\{ ( 4,11 ) \}\)

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Definitions:

Graph

A visual representation of data, relationships, or functions, typically displayed using lines, bars, or points on a coordinate system.

Second-Order Model

A model that includes squared terms of the predictors, allowing the model to capture curvature in the relationship between the predictors and response.

Predictor Variables

Variables in statistical models that are used to predict or explain changes in the dependent variable.

With Interaction

In statistical analysis, refers to a model that includes terms for interactions between variables to assess if the effect of one variable on the response variable changes at different levels of another variable.