x_1' = x_1 \
x_2' = -x_2

X = (1, 2)
X': (x(X) | (-y(X)))
f = Segment(X, X')
Text1: "\vec{x} = \begin{pmatrix} " + (LaTeX[x(X)]) + " \\ " + (LaTeX[y(X)]) + " \end{pmatrix}"
Text2: "\vec{x}' = \begin{pmatrix} " + (LaTeX[x(X')]) + "  \\  " + (LaTeX[y(X')]) + " \end{pmatrix}"