Use the Matrix Capabilities of a Graphing Utility to Solve $$\left\{ \begin{array} { l l } - 14 x + 14 y + 21 z & = 10 \\7 x - 7 y & = - 5 \\7 x + 28 z & = 20\end{array} \right.$$

question 20

Multiple Choice

Use the matrix capabilities of a graphing utility to solve the following system of linear equations: $$\left\{ \begin{array} { l l } - 14 x + 14 y + 21 z & = 10 \\7 x - 7 y & = - 5 \\7 x + 28 z & = 20\end{array} \right.$$

• A) \(\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 20 } { 7 } \\
• \frac { 25 } { 7 } \\
• 0
• \end{array} \right]\)
• B) \(\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 10 } { 7 } \\
• 0 \\
• \frac { - 15 } { 7 }
• \end{array} \right]\)
• C) \(\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { - 15 } { 7 } \\
• \frac { 10 } { 7 } \\
• \frac { 5 } { 7 }
• \end{array} \right]\)
• D) \(\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 5 } { 7 } \\
• \frac { - 20 } { 7 } \\
• \frac { 10 } { 7 }
• \end{array} \right]\)
• E) \(\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { - 15 } { 7 } \\
• \frac { - 10 } { 7 } \\
• \frac { 10 } { 7 }
• \end{array} \right]\)

Comprehend the signaling theory in the context of advertising and product quality.

Assess the economic implications of brand names on consumer choice and market efficiency.

Understand the relationship between marginal revenue and pricing within a monopoly.

Explain the concept and implications of a natural monopoly.

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