To model the expression $2 - (-9)$ on a number line, what is the correct procedure?

Start at 2 and move 9 units to the left.

Start at 2 and move 9 units to the right.

Start at -9 and move 2 units to the right.

Start at 9 and move 2 units to the left.

Which statement correctly describes the movement on a number line for the expression $-5 - 8$?

Start at -5 and move 8 units to the right.

Start at -5 and move 8 units to the left.

Start at 8 and move 5 units to the left.

Start at -8 and move 5 units to the right.