Putting graphs side by side in Latex

I have two graphs that I want to put side by side in Latex. At the moment they can only be displayed one underneath the other.
Both are in the format:

documentclass[11pt,a4paper]{article}

usepackage[sort]{natbib}
usepackage{fancyhdr}
usepackage{graphicx}
usepackage{amsmath,amsfonts,amsthm,nicefrac,latexsym,amsfonts,amsbsy,bm}
usepackage[nottoc,numbib]{tocbibind}

usepackage{lipsum}
usepackage{hyperref}
usepackage{tikz}
usepackage{pgfplots}
pgfplotsset{compat=newest}
usepackage{mwe}

begin{document}

begin{tikzpicture}[xscale=0.8,yscale=2,domain=0.5:7]

% Axes

draw[thick,->] (-.5,0) -- (10,0) node[right] {x};

draw[thick,->] (0,-0.1) -- (0,2.5) node[right] {f(x)};

% Curve

draw[color=white] (4.6,2.2) node[above,black]{Large {Backward Difference}};

draw[thick,color=black,domain=1.25:9,smooth,variable=x] plot ({10-x},{-ln(x)+2.5});

draw[very thick,color=red] (3,0.555)--(4.640957,0.825) node[above left,black]{Approximation};

draw[very thick,color=blue,domain=3.5:8.52,smooth,variable=x] plot (x,{0.81 + 0.2*(x-4.640957) ) }) node[below right,black] {Actual Derivative};

% Points

foreach point in {(3,0.555),(4.640957,0.825)}{% points fill point circle (1.5pt);}

% Axis labels

foreach x/xtext in {3/{x_{i-1}},4.640957/{x_i},7/{x_{i+1}}} draw(x cm,1pt) -- (x cm,-1pt) node[anchor=north,fill=white] {xtext};

end{tikzpicture}

end{document}