How to draw the image in beamer?

Question

I intend to draw the following image in beamer presentation. May you please help me to draw that?

I intend to use the following code but it gives an error about package. Of course, the code is not complete because I do not know how to identify the line and the area under that in the code.

\documentclass[tikz,border=2mm]{standalone}
\begin{document}
\begin{tikzpicture}
\draw[help lines, color=gray!30, dashed] (-4.9,-4.9) grid (4.9,4.9);
\draw[->,ultra thick] (-5,0)--(5,0) node[right]{$x$};
\draw[->,ultra thick] (0,-5)--(0,5) node[above]{$y$};
\end{tikzpicture}
\end{document}

If I had a specific code, I would put on that, but I need any help for writing a proper code — user118746, Nov 01 '21 at 17:50

Jasper Habicht · Accepted Answer · 2021-11-01T19:45:17.367

2

Maybe something like this? I am not sure how the grey area should be drawn.

\documentclass[tikz,border=2mm]{standalone}
\begin{document}
\begin{tikzpicture}
\fill[black!10] (-4,4.5) to[out=0,in=180] (-3,5) -- (5,-3) to[out=180,in=-45] (1,-2) -- (-4,3) -- cycle;
\draw[ultra thick] (-3,5) -- (5,-3) node[above right, midway]{$x_1 + x_2 = y$};
\draw[help lines, color=gray!30, dashed] (-3.9,-3.9) grid (4.9,4.9);
\draw[->, ultra thick] (-4,0) -- (5,0) node[right]{$x_1$};
\draw[->, ultra thick] (0,-4) -- (0,5) node[above]{$x_2$};
\end{tikzpicture}
\end{document}

Or even more like the original:

\documentclass[tikz,border=2mm]{standalone}
\usepackage{mathptmx}
\begin{document}
\begin{tikzpicture}
\fill[black!20] (-4,4.5) to[out=0,in=180] (-3,5) -- (5,-3) to[out=180,in=-45] (.5,-1.5) -- (-4,3) -- cycle;
\draw[ultra thick] (-3,5) -- (5,-3) node[above right, midway]{$x_1 + x_2 = y$};
\draw[thick] (-4,0) -- (5,0) node[right]{$x_1$};
\draw[thick] (0,-4) -- (0,5) node[above]{$x_2$};
\end{tikzpicture}
\end{document}

If you would like to fill the area with a pattern, I would recommend the patterns library of TikZ that needs to be loaded in the preamble of your document (after having loaded the tikz package). Please consult chapter 62 of the TikZ/PGF documentation regarding the different options.

\documentclass[tikz,border=2mm]{standalone}
\usepackage{mathptmx}
\usetikzlibrary{patterns}
\begin{document}
\begin{tikzpicture}
\fill[pattern=north east lines] (-4,4.5) to[out=0,in=180] (-3,5) -- (5,-3) to[out=180,in=-45] (.5,-1.5) -- (-4,3) -- cycle;
\draw[ultra thick] (-3,5) -- (5,-3) node[above right, midway]{$x_1 + x_2 = y$};
\draw[thick] (-4,0) -- (5,0) node[right]{$x_1$};
\draw[thick] (0,-4) -- (0,5) node[above]{$x_2$};
\end{tikzpicture}
\end{document}

edited Nov 01 '21 at 19:45

answered Nov 01 '21 at 18:01

Jasper Habicht

48,848

Thank you very much for your help. Regarding the grey area, it just shows the area under the line, nothing more – user118746 Nov 01 '21 at 18:49
I put the code on the file, now I have the following errors: Latex error: Environment tikspicture undefined. Missing number, treated as zero. Illegal unit of measure (pt inserted). Undefined control sequence. Latex error: \begin{minipage} on input line ended by \end{tikzpicture} – user118746 Nov 01 '21 at 18:52
1

You need to load TikZ. Put \usepackage{tikz} in your preamble. – Jasper Habicht Nov 01 '21 at 19:15
And How can I reduce its size? – user118746 Nov 01 '21 at 19:18
If I want to put some pattern instead of gray color under the line, what should I do? – user118746 Nov 01 '21 at 19:25
As for resizing, please see for example https://tex.stackexchange.com/q/6388/47927 . As for the pattern: What kind of pattern do you have in mind? – Jasper Habicht Nov 01 '21 at 19:31
hachure, for example a set of parallel lines instead of color – user118746 Nov 01 '21 at 19:34
I prefer the original :-) +1 – Sebastiano Nov 01 '21 at 21:46

How to draw the image in beamer?

1 Answers1