中心が原点 \begin{tikzpicture}[x=3cm,y=3cm] \node (O) at (0,0) [below left] {O}; \draw [thick, -stealth](-1.5,0)--(1.5,0) node [anchor=north]{$x$}; \draw [thick, -stealth](0,-1.2)--(0,1.2) node [anchor=east]{$y$}; \end{tikzpicture} <script type="text/tikz"> \begin…