Solve the System by the Addition Method $$\begin{array} { l } - 3 x - 4 y = - 21 \\6 x + 8 y = 42\end{array}$$

question 12

Multiple Choice

Solve the system by the addition method. $$\begin{array} { l } - 3 x - 4 y = - 21 \\6 x + 8 y = 42\end{array}$$

• A) \(( - 1,6 )\)
• B) \(( 2 , - 12 )\)
• C) Infinitely many solutions; \(\left\{ ( x , y ) \mid y = - \frac { 3 } { 4 } x + \frac { 21 } { 4 } \right\}\); dependent system
• D) No solution; { } ; inconsistent system

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