(a) Show that the following set is a curve: \mathbf{M}=\left\{(x, y) \in \mathbb{R}^{2} \mid x^{2}-3 x y+2 y^{2}=1\right\} Briefly explain your reasoning. O Compute the arc length of the curve

X=\left\{(x, y, z) \in \mathbb{R}^{3} \mid 0