An ‘ordered pair’ is simply two numbers in a certain order. For example, the numbers ‘2’ and ‘3’ can form two ordered pairs: 2, 3 and 3, 2. Ordered pairs can also contain the same number twice. For example: 2, 2 and 3, 3
A very important application of ordered pairs is to locate points on a grid or map. For street maps it is common to use a letter and a number, eg: B17 or D5. This is not very accurate, but if two numbers were used instead of a number and a letter, then people would easily get them in the wrong order and get lost! In mathematics, we use two numbers to accurately locate a position on a rectangular grid. Eric has been doing ordered pairs in school and used worksheets to make several pictures. Foghorn Leghorn was one of his more complicated graphs.