Question

you move down 2 units and left 1 unit. you end at (4, -5). where did you start?

Explanation:

Step1: Reverse the x - coordinate movement

Moving left 1 unit to get to 4 means we started 1 unit to the right of 4. So we add 1 to 4.
$4 + 1=5$

Step2: Reverse the y - coordinate movement

Moving down 2 units to get to - 5 means we started 2 units above - 5. So we add 2 to - 5.
$-5+2 = - 3$

Answer:

$(5,-3)$