Question

you move down 1 unit and left 4 units. you end at (-5, -1). where did you start?

Explanation:

Step1: Reverse left - move

Moving left 4 units is subtracting 4 from x - coordinate. To reverse, add 4 to the end x - coordinate.
$-5 + 4=-1$

Step2: Reverse down - move

Moving down 1 unit is subtracting 1 from y - coordinate. To reverse, add 1 to the end y - coordinate.
$-1+1 = 0$

Answer:

$(-1,0)$