4hw

\documentclass{article}
\usepackage[english,russian]{babel}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{width = 15 cm, compat = 1.3}


\begin{document}
\begin{tikzpicture}
\begin{axis}[
title = Домашнее задание 1,
xmin = -5,
xmax = 5,
ymin = 0,
ymax = 25,
axis lines = middle,
samples=40,
xlabel = Ox,
ylabel = Oy,
minor tick num = 5,
grid = both,
legend style = {at = {(0.2, 0.05)},anchor = south east,
legend columns = 1;}
]
\addplot+[domain=-5:5, green, mark = square, mark size = 3, line width = 1pt]{e^x};
\addplot+[domain=-5:5, orange, mark = triangle,  mark size = 5, line width = 1pt]{e^(-x)};
\addplot[domain=-5:5, red, dashed, line width = 2pt]{12};
%solid - сплошная, dotted - в виде точек
\legend{$e^x$, $e^{-x}$, $y = 12$};
\end{axis}
\end{tikzpicture}

\begin{tikzpicture}
\begin{axis}[
title = Домашнее задание 2,
ybar,
bar width = 10 pt,
xlabel = Year,
ylabel = Temperature,
ymin = 10,
ymax = 55,
xtick = {2013, 2014, 2015},
ytick = {10, 20, 30, 35, 40, 45, 50},
minor tick num = 5,
grid = both,
grid style = dashed,
legend style={at={(0.5, -0.3)},anchor = south, legend columns = 1},
]
\addplot [red, fill] coordinates {(2013, 35) (2014, 33) (2015, 25)};
\addplot  [yellow, fill] coordinates {(2013, 33) (2014, 29) (2015, 30)};
\addplot  [green, fill] coordinates {(2013, 40) (2014, 38) (2015, 41)};
\addplot [blue, fill]  coordinates {(2013, 24) (2014, 28) (2015, 25)};
\legend{Саратов, Москва, Пермь, Омск};
\end{axis}
\end{tikzpicture}

\end{document}