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Maximize \(\displaystyle p = 8 x + 22 y\) subject to \(\displaystyle \begin{cases}79 x + 44 y \leq 3476 \\ 69 x + 98 y \leq 6762 \\ x \geq 0, y \geq 0 \end{cases}\)
Drawing a graph gives
Solving the system of equations gives the intersection at \(\displaystyle \left( \frac{21560}{2353}, \ \frac{147177}{2353}\right)\). Making a table gives to test the verticies in \(\displaystyle p=8 x + 22 y\) gives
\begin{question}Maximize $p = 8 x + 22 y$ subject to $\begin{cases}79 x + 44 y \leq 3476 \\ 69 x + 98 y \leq 6762 \\ x \geq 0, y \geq 0 \end{cases}$ \soln{9cm}{Drawing a graph gives\newline \begin{tikzpicture}[scale=0.1] \draw[very thick, color=blue, opacity=0.3, xstep=10, ystep=10] (-10,-10) grid (98,98); \draw[latex-latex, very thick] (-12.0,0)--(100.0,0) node[right]{$x$}; \draw[latex-latex, very thick] (0,-12.0)--(0,100.0) node[above]{$y$}; \foreach \x in { -10,0,...,98 }{ \pgfmathsetmacro{\xtick}{\x != 0 ? "\x" : ""} \draw (\x, .2) -- (\x,-.2) node[below]{$\xtick$}; } \foreach \y in { -10,0,...,98 }{ \pgfmathsetmacro{\ytick}{\y != 0 ? "\y" : ""} \draw (.2, \y) -- (-.2, \y) node[left]{$\ytick$}; } \filldraw[fill=gray,opacity=.8] (0, 79) -- (0, 98) -- (98, 98) -- (98, 0) -- (44, 0) -- (0, 79); \filldraw[fill=gray,opacity=.8] (0, 69) -- (0, 98) -- (98, 98) -- (98, 0) -- (98, 0) -- (0, 69); \draw[fill=red] (21560/2353,147177/2353) circle (2pt); \end{tikzpicture} Solving the system of equations gives the intersection at $\left( \frac{21560}{2353}, \ \frac{147177}{2353}\right)$. Making a table gives to test the verticies in $p=8 x + 22 y$ gives \begin{center} \begin{tabular}{|c|c|}\hline Point & Function \\[3pt] \hline $\left( 0, \ 0\right)$ & $0$ \\[3pt] \hline $\left( 44, \ 0\right)$ & $352$ \\[3pt] \hline $\left( \frac{21560}{2353}, \ \frac{147177}{2353}\right)$ & $\frac{3410374}{2353}$ \\[3pt] \hline $\left( 0, \ 69\right)$ & $1518$ \\[3pt] \hline \end{tabular} \end{center}The gives the maximum value of $1518$ located at $\left( 0, \ 69\right)$. } \end{question}
\documentclass{article} \usepackage{tikz} \usepackage{amsmath} \usepackage[margin=2cm]{geometry} \usepackage{tcolorbox} \newcounter{ExamNumber} \newcounter{questioncount} \stepcounter{questioncount} \newenvironment{question}{{\noindent\bfseries Question \arabic{questioncount}.}}{\stepcounter{questioncount}} \renewcommand{\labelenumi}{{\bfseries (\alph{enumi})}} \newif\ifShowSolution \newcommand{\soln}[2]{% \ifShowSolution% \noindent\begin{tcolorbox}[colframe=blue,title=Solution]#2\end{tcolorbox}\else% \vspace{#1}% \fi% }% \newcommand{\hideifShowSolution}[1]{% \ifShowSolution% % \else% #1% \fi% }% \everymath{\displaystyle} \ShowSolutiontrue \begin{document}\begin{question}(10pts) The question goes here! \soln{9cm}{The solution goes here.} \end{question}\end{document}
<p> <p>Maximize <img class="equation_image" title=" \displaystyle p = 8 x + 22 y " src="/equation_images/%20%5Cdisplaystyle%20p%20%3D%208%20x%20%2B%2022%20y%20" alt="LaTeX: \displaystyle p = 8 x + 22 y " data-equation-content=" \displaystyle p = 8 x + 22 y " /> subject to <img class="equation_image" title=" \displaystyle \begin{cases}79 x + 44 y \leq 3476 \\ 69 x + 98 y \leq 6762 \\ x \geq 0, y \geq 0 \end{cases} " src="/equation_images/%20%5Cdisplaystyle%20%5Cbegin%7Bcases%7D79%20x%20%2B%2044%20y%20%5Cleq%203476%20%5C%5C%2069%20x%20%2B%2098%20y%20%5Cleq%206762%20%5C%5C%20x%20%5Cgeq%200%2C%20y%20%5Cgeq%200%20%5Cend%7Bcases%7D%20" alt="LaTeX: \displaystyle \begin{cases}79 x + 44 y \leq 3476 \\ 69 x + 98 y \leq 6762 \\ x \geq 0, y \geq 0 \end{cases} " data-equation-content=" \displaystyle \begin{cases}79 x + 44 y \leq 3476 \\ 69 x + 98 y \leq 6762 \\ x \geq 0, y \geq 0 \end{cases} " /> </p> </p>
<p> <p>Drawing a graph gives<br>
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Solving the system of equations gives the intersection at <img class="equation_image" title=" \displaystyle \left( \frac{21560}{2353}, \ \frac{147177}{2353}\right) " src="/equation_images/%20%5Cdisplaystyle%20%5Cleft%28%20%5Cfrac%7B21560%7D%7B2353%7D%2C%20%5C%20%20%5Cfrac%7B147177%7D%7B2353%7D%5Cright%29%20" alt="LaTeX: \displaystyle \left( \frac{21560}{2353}, \ \frac{147177}{2353}\right) " data-equation-content=" \displaystyle \left( \frac{21560}{2353}, \ \frac{147177}{2353}\right) " /> . Making a table gives to test the verticies in <img class="equation_image" title=" \displaystyle p=8 x + 22 y " src="/equation_images/%20%5Cdisplaystyle%20p%3D8%20x%20%2B%2022%20y%20" alt="LaTeX: \displaystyle p=8 x + 22 y " data-equation-content=" \displaystyle p=8 x + 22 y " /> gives <center>
\begin{tabular}{|c|c|}\hline
Point & Function \\[3pt] \hline
<img class="equation_image" title=" \displaystyle \left( 0, \ 0\right) " src="/equation_images/%20%5Cdisplaystyle%20%5Cleft%28%200%2C%20%5C%20%200%5Cright%29%20" alt="LaTeX: \displaystyle \left( 0, \ 0\right) " data-equation-content=" \displaystyle \left( 0, \ 0\right) " /> & <img class="equation_image" title=" \displaystyle 0 " src="/equation_images/%20%5Cdisplaystyle%200%20" alt="LaTeX: \displaystyle 0 " data-equation-content=" \displaystyle 0 " /> \\[3pt] \hline
<img class="equation_image" title=" \displaystyle \left( 44, \ 0\right) " src="/equation_images/%20%5Cdisplaystyle%20%5Cleft%28%2044%2C%20%5C%20%200%5Cright%29%20" alt="LaTeX: \displaystyle \left( 44, \ 0\right) " data-equation-content=" \displaystyle \left( 44, \ 0\right) " /> & <img class="equation_image" title=" \displaystyle 352 " src="/equation_images/%20%5Cdisplaystyle%20352%20" alt="LaTeX: \displaystyle 352 " data-equation-content=" \displaystyle 352 " /> \\[3pt] \hline
<img class="equation_image" title=" \displaystyle \left( \frac{21560}{2353}, \ \frac{147177}{2353}\right) " src="/equation_images/%20%5Cdisplaystyle%20%5Cleft%28%20%5Cfrac%7B21560%7D%7B2353%7D%2C%20%5C%20%20%5Cfrac%7B147177%7D%7B2353%7D%5Cright%29%20" alt="LaTeX: \displaystyle \left( \frac{21560}{2353}, \ \frac{147177}{2353}\right) " data-equation-content=" \displaystyle \left( \frac{21560}{2353}, \ \frac{147177}{2353}\right) " /> & <img class="equation_image" title=" \displaystyle \frac{3410374}{2353} " src="/equation_images/%20%5Cdisplaystyle%20%5Cfrac%7B3410374%7D%7B2353%7D%20" alt="LaTeX: \displaystyle \frac{3410374}{2353} " data-equation-content=" \displaystyle \frac{3410374}{2353} " /> \\[3pt] \hline
<img class="equation_image" title=" \displaystyle \left( 0, \ 69\right) " src="/equation_images/%20%5Cdisplaystyle%20%5Cleft%28%200%2C%20%5C%20%2069%5Cright%29%20" alt="LaTeX: \displaystyle \left( 0, \ 69\right) " data-equation-content=" \displaystyle \left( 0, \ 69\right) " /> & <img class="equation_image" title=" \displaystyle 1518 " src="/equation_images/%20%5Cdisplaystyle%201518%20" alt="LaTeX: \displaystyle 1518 " data-equation-content=" \displaystyle 1518 " /> \\[3pt] \hline
\end{tabular}
</center>The gives the maximum value of <img class="equation_image" title=" \displaystyle 1518 " src="/equation_images/%20%5Cdisplaystyle%201518%20" alt="LaTeX: \displaystyle 1518 " data-equation-content=" \displaystyle 1518 " /> located at <img class="equation_image" title=" \displaystyle \left( 0, \ 69\right) " src="/equation_images/%20%5Cdisplaystyle%20%5Cleft%28%200%2C%20%5C%20%2069%5Cright%29%20" alt="LaTeX: \displaystyle \left( 0, \ 69\right) " data-equation-content=" \displaystyle \left( 0, \ 69\right) " /> . </p> </p>