Problem 1
When you see "(100, -50)" it is an ordered pair with two components; the
first component is 100 which indicates the distance to the right of the origin
(to the left if it is negative), and the second component is -50 which
indicates the distance down from the origin (up if it is positive). This movement
to the left or right and up or down locates a unique point; see Figure 15.13.
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