Solve the System by the Method of Substitution $\left\{ \begin{aligned}x - y & = 4 \\7 x - 4 y & = 37\end{aligned} \right.$

question 98

Multiple Choice

Solve the system by the method of substitution. $\left\{ \begin{aligned}x - y & = 4 \\7 x - 4 y & = 37\end{aligned} \right.$

• A)(7, 3)
• B)(7, -3)
• C)(-8, -4)
• D)(-7, 3)
• E)(8, 4)

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Definitions:

Critical Value

A threshold in hypothesis testing that defines the boundary or cut-off point, beyond which the null hypothesis is rejected.

F-ratio

A statistical test used to determine the ratio of variance between two samples, often used in analysis of variance (ANOVA).

Degrees Freedom

Degrees of freedom are the number of values in a calculation that are free to vary, often related to the sample size in statistical analyses.

F-ratio Equation

The statistical calculation used in ANOVA testing to compare the variance among group means to the variance within groups, indicating whether significant differences exist.