​Use the Matrix Capabilities of a Graphing Utility to Solve $$\left\{ \begin{array} { c c c } 15 x - 5 y & = & 3 \\10 x + 10 y & = & 6 \\20 z & = & - 12\end{array} \right.$$

question 40

Multiple Choice

​Use the matrix capabilities of a graphing utility to solve the following system of linear equations: $$\left\{ \begin{array} { c c c } 15 x - 5 y & = & 3 \\10 x + 10 y & = & 6 \\20 z & = & - 12\end{array} \right.$$

• A)​ \[\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { - 3 } { 10 } \\\\
• \frac { 9 } { 10 } \\\\
• \frac { - 3 } { 5 }
• \end{array} \right]\]
• B)​ \[\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 9 } { 10 } \\
• 0 \\
• \frac { - 3 } { 5 }
• \end{array} \right]\]
• C)​ \[\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { - 3 } { 10 } \\\\
• \frac { 3 } { 10 } \\\\
• \frac { - 3 } { 5 }
• \end{array} \right]\]
• D)​ \[\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 3 } { 10 } \\\\
• \frac { - 3 } { 10 } \\\\
• 0
• \end{array} \right]\]
• E)​ \[\left[ \begin{array} { l }
• x \\
• y \\
• z
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 3 } { 10 } \\\\
• \frac { 3 } { 10 } \\\\
• \frac { - 3 } { 5 }
• \end{array} \right]\]

---

Definitions:

Confidence Index

A measure, often used in financial contexts, reflecting the confidence or optimism that investors have in the financial markets or in the economy as a whole.

Bond Yields

The return an investor realizes on a bond, calculated as the coupon payments received from the bond relative to its price or face value.

Bullish Signals

Indications in the financial markets suggesting that the prices of securities are likely to rise.

Frequent Trading

A strategy involving the high turnover of portfolio assets, aiming to capitalize on short-term market movements.