Solve the System A) $\{ ( 4 , - 2 , - 7 ) \}$

question 78

Multiple Choice

Solve the system.
- $$\begin{array} { l } \frac { 1 } { x } + \frac { 1 } { y } - \frac { 1 } { z } = - \frac { 3 } { 28 } \\\frac { 3 } { x } - \frac { 1 } { y } + \frac { 3 } { z } = \frac { 23 } { 28 } \\\frac { 1 } { x } - \frac { 7 } { y } + \frac { 6 } { z } = \frac { 67 } { 28 }\end{array}$$

• A) \(\{ ( 4 , - 2 , - 7 ) \}\)
• B) \(\{ ( 4 , - 2,7 ) \}\)
• C) \(\left\{ \left( \frac { 1 } { 4 } , - \frac { 1 } { 2 } , \frac { 1 } { 7 } \right) \right\}\)
• D) \(\left\{ \left( \frac { 1 } { 4 } , - \frac { 1 } { 2 } , - \frac { 1 } { 7 } \right) \right\}\)

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