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y = x – 2. Give four example for the ordered pair (x, y).
6.
Equality of ordered pairs
Let (m, n) and (p, q) be two ordered pairs.
(m, n) = (p, q) if and only if m = p and n = q.
Example: find x and y if (x + 1, 6) = (8, 2y – 4)
7.
Notations of intervals:
Let a and b be real numbers.
A = [a, b] denotes the set of all real numbers between a and b (a and b are included). a b
8.
a b A = (a, b) denotes the set of all real numbers between a and b (a and b are excluded). A = [a, b) denotes the set of all real numbers between a and b (a is included and b is excluded). a b
9.
a b A = (a, b] denotes the set of all real numbers between a and b (a is excluded and b is included).