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 119

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:

Purchasing-Power Parity

An economic theory that compares different countries' currencies through a "basket of goods" approach, to assess the relative value of currencies.

Money Supply Growth

Money supply growth refers to the rate at which the quantity of money available in an economy increases over a specific period.

Nominal Exchange Rate

The rate at which one country's currency can be exchanged for another's, not adjusted for inflation differences between the two countries.

Real Exchange Rate

The price of a country's goods and services in comparison to those of another country, adjusted for exchange rate changes.