Reference points
You may have realized that you need to know where the Library is
located, i.e., its position, to get started with your graph. In
order to measure positions and distances, a reference point is
needed.
For this activity, the reference point will be at
position 0, which we'll call the origin. Let's say that the Library
is located at the origin.
Vijay will start his trip at the
Library, i.e., at position 0, then move to the Movie Theater. You'll
also need to know the Movie Theater's position. For this activity,
let's say that the Movie Theater is 1 meter from the Library (since
you can't walk 7400 meters in the classroom!).
In the next
step, you'll find the Library's location, which we've already set,
and you'll mark it on the masking tape "street". You'll also locate
and mark the Movie Theater on the "street".