答案1
欢迎来到 TeX.SE!请始终提供 MWE(最小工作示例),即一份完整的小文档,可重现您的问题。
\documentclass[margin=3mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
axis lines = middle,
xlabel={$\omega_{m}$},
ylabel={T},
label style = {below left},
xmin=0, xmax=28, xtick={22},
ymin=0, ymax=13, ytick={11}]
\addplot[red, ultra thick, domain=0:22] {(22-x)/2};
\end{axis}
\end{tikzpicture}
\end{document}