3

First question here;

Hello, a friend of mine made this a while back, but can't remember the latex code to make it. I need to make it myself and have no idea how this is done. I need to know how. Thank you very much!

PS: he said he used no programs or expansions, only the basic LaTeX.

enter image description here

7

For example:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
b=\begin{cases}
y_1-ax_1\\
y_2-ax_2
\end{cases}
\]

If amsmath is forbidden:

\[
\left\{
\begin{array}{l}
y_1-ax_1\\
y_2-ax_2
\end{array}
\right.
\]

\end{document}

Please observe, that the curly brace should be larger than this one in your question.

enter image description here

1

I add my simple two MWE.

enter image description here

\documentclass{article}
\usepackage{mathtools}

\begin{document}
\[b=\left\{\begin{matrix} y_1-ax_1& \\ y_2-ax_2& \end{matrix}\right.\]
\end{document}

enter image description here

\documentclass{article}
    \usepackage{amsmath}
    \usepackage{cases}

    \begin{document}

    \begin{numcases}{b=}
      y_1-ax_1 & \nonumber \\ 
      y_2-ax_2 &   \nonumber
    \end{numcases}

    \end{document}

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