# How can we draw these graphs like in this book?

Can you show me which tools we can use to draw the graphs look like in this book? (see below figure). Sorry, I don't know exactly where I can post this question.

• Welcome to TeX-sx! Your question has been migrated here as we might be able to help. To do that, though, we'll need to know what software you've got available to you. – Joseph Wright Apr 23 '15 at 18:34
• @JosephWright: thanks, I've used LaTeX but it's quite complicated for me to draw freely graphs like in above figure. I wonder if there are other apps to do this job? – Anh-Thi DINH Apr 24 '15 at 9:42
• Ah, I have found the below answer from Robert. :) – Anh-Thi DINH Apr 24 '15 at 9:51
• Welcome to TeX.SX. Questions about how to draw specific graphics that just post an image of the desired result are really not reasonable questions to ask on the site. Please post a minimal compilable document showing that you've tried to produce the image and then people will be happy to help you with any specific problems you may have. See minimal working example (MWE) for what needs to go into such a document. – Reinstate Monica - M. Schröder Apr 24 '15 at 11:33

You can use several plotting packages, some of them very sophisticated.

My package xpicture is specially designed for mathematical plottings.

Try this code:

\documentclass{standalone}
\usepackage{xpicture}
\begin{document}
\newlpoly{\p}{-5}{3}              % Defines y=-5+3x
\renewcommand{\Pictlabelsep}{0.2}
\setlength{\unitlength}{.75cm}
\begin{Picture}(-1.5,-1.5)(6,6)
\cartesianaxes(-1.5,-1.5)(5.5,5.5)
\xVECTOR(5.5,0)(5.6,0)
\xVECTOR(0,5.5)(0,5.6)
\Put[E](5.5,0){$x$}
\Put[N](0,5.5){$y$}
\pictcolor{cyan}
{\thicklines
\PlotFunction{\p}{1.5}{3.25} % Plots p between x=1.5 and x=3.25
\Put(2,1){\circle*{0.2}}
\Put(3,4){\circle*{0.2}}}
\Polyline(2,1)(3,1)(3,4)
\Put[SE](2,1){$\Delta x=1$}
\Put[E](3,2.5){$\Delta y=3$}
\p{3.1}{\x}{\Dx}
\Put[E](3.1,\x){$\leftarrow$ slope 3}
\end{Picture}
\end{document}