You should have clicked on 5,
negative 5, negative 1, and 1.
Remember that adding a positive
moves us to the right and
adding a negative moves us to the left.
So when you add a positive number
to another positive number,
like in this example.
You move to the right.
So we start at 3 and
move to the right 2 to end at 5.
Here we start with negative 3 and
since we're adding a negative we move
to the left 2 to end at negative 5.
Here we also started with negative 3 but
we're adding a positive so
we move to the right 2.
To end at negative 1.
And here we start at positive 3 and
move to the left 2,
since we're adding negative 2,
and we end at 1.
