Question

you move up 2 units and down 9 units. you end at (3, -5). where did you start?

Explanation:

Step1: Analyze vertical movement

Let the starting - y - coordinate be $y$. The vertical movement is $2 - 9=-7$. So $y+(2 - 9)=-5$.

Step2: Solve for starting y - coordinate

$y-7=-5$, then $y=-5 + 7=2$.
The x - coordinate doesn't change during vertical movement, so the starting point is $(3,2)$.

Answer:

$(3,2)$