Why are the vertical tick marks different sizes for these two number lines if the y-scale is 1.8 for the first number line but the x- and y-scales are both 1.8 for the second?
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\documentclass[12pt]{article}\usepackage{tikz}\usetikzlibrary{arrows}\begin{document}\begin{tikzpicture}[xscale=3][yscale=1.8]\draw[-latex] (0,0)--(2,0);\foreach \x in {0,...,6}\draw (\x/3,-0.1)--(\x/3,0.1);\foreach \x in {0,...,2}\node[below] at (\x,-0.15) {\x};\end{tikzpicture}\vspace{3cm}\begin{tikzpicture}[scale=1.8]\draw[-latex] (0,0)--(4.5,0) ;\foreach \x in {0,...,12}\draw (\x/3,-0.1)--(\x/3,0.1);\foreach \x in {0,...,4}\node[below] at (\x,-0.15) {\x};\end{tikzpicture}\end{document}