Solve the System $$\left\{ \begin{array} { r r } 7 x - 8 y + 9 z = & - 7 \\8 x + 4 y + 7 z = & 8 \\28 x - 32 y + 36 z = & 8\end{array} \right.$$

question 68

Multiple Choice

Solve the system. If there is no solution or if the system's equations are dependent, so state.
- $$\left\{ \begin{array} { r r } 7 x - 8 y + 9 z = & - 7 \\8 x + 4 y + 7 z = & 8 \\28 x - 32 y + 36 z = & 8\end{array} \right.$$

• A) infinitely many solutions; dependent equations
• B) \(\{ ( - 7,8,8 ) \}\)
• C) \(\{ ( 4,4 , - 1 ) \}\)
• D) no solution or \(\varnothing\)

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