These graphs are mirror images because the two bases are reciprocals of each other. For example, the graph of the first function contains the points $\displaystyle{\left({1},\frac{{3}}{{2}}\right)}\usepackage{cmbright}\Huge\$ and $\displaystyle{\left({2},\frac{{9}}{{4}}\right)}\usepackage{cmbright}\Huge\$ . The graph of the second function contains their "reflections", $\displaystyle{\left(-{1},\frac{{3}}{{2}}\right)}\usepackage{cmbright}\Huge\$ and $\displaystyle{\left(-{2},\frac{{9}}{{4}}\right)}\usepackage{cmbright}\Huge\$ .