Question

how can you move the trowel to the new point where the dinosaur bone is buried? move the trowel units left, then ? units ?

Explanation:

Step1: Determine horizontal movement

Count the number of grid - squares from the trowel's position to the bone's position in the horizontal direction. The trowel is at $x = 0$ and the bone is at $x=-3$, so move 3 units left.

Step2: Determine vertical movement

Count the number of grid - squares from the trowel's position to the bone's position in the vertical direction. The trowel is at $y = 0$ and the bone is at $y=-2$, so move 2 units down.

Answer:

Move the trowel 3 units left, then 2 units down.