A $5\mathrm{.}59$ kg particle$-$like object moves in a plane with velocity components $v_x=61\mathrm{.}9\frac{m}{s}$ and $v_y=79\mathrm{.}2\frac{m}{s}$ as it passes through the point with $(x,y)$ coordinates of $)$ m $.$ Just then, in unit$-$vector notation, what is its angular momentum relative to $($a$)$ the origin and $($b$)$ the point $(-8\mathrm{.}63,-8\mathrm{.}63)m?$