Answer
$\lt -6, 8 \gt $
Work Step by Step
Since $v$ has the same direction as $u$ and since it is a multiple of a unit vector $n$, we can write it as: $\overrightarrow{v} = < -3 n, 4n>$
To find the unit vector, we must first find the magnitude:
$\sqrt {((-3n)^{2} + (4n)^{2}} = 10$
or, $9n^2+16n^2 =100$
This implies that $n^2=4 \implies n=2$
Now, $\overrightarrow{v} = < -3 (2), 4 (2)> = \lt -6, 8 \gt $
