Solve the System of Equations by the Substitution Method $$\left\{ \begin{array} { r r } x + 6 y & = 7 \\- 4 x + 7 y & = - 28\end{array} \right.$$

question 86

Multiple Choice

Solve the system of equations by the substitution method.
- $$\left\{ \begin{array} { r r } x + 6 y & = 7 \\- 4 x + 7 y & = - 28\end{array} \right.$$

• A) \(( - 7 , - 1 )\)
• B) \(( 7,0 )\)
• C) \(( 8,7 )\)
• D) \(\varnothing\)

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