Answer
$ -5 \overrightarrow{i} + 8 \overrightarrow{ j}$
Work Step by Step
We can see that the notation $\lt a, b \gt $ is same as that of $a \overrightarrow{i} +b \overrightarrow{ j}$
Thus, our answer becomes:
$a \overrightarrow{i} +b \overrightarrow{ j} = -5 \overrightarrow{i} + 8 \overrightarrow{ j}$
