Answer
(a) $v$ is a scalar multiple of $z$.
(b) $w$ is not a scalar multiple of $z$.
Work Step by Step
(a) since $v=\left(2,\frac{4}{3},-\frac{10}{3}\right)=\frac{2}{3}\left(3,2,-5\right)$, then $v$ is a scalar multiple of $z$.
(b) $w$ is not a scalar multiple of $z$.
