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Fortunately, the examples we have just seen are exceptional. As a general rule, a pair of linear equations with two unknown variables will yield a unique solution. Let us try the equations y = x + a, and x = -y + b. For any choice of a and b, you will find that the lines intersect in one point.

Substitution

Elementary Algebra


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Visual Math Learning is a free educational web site featuring an interactive on-line tutorial for teaching elementary mathematics and basic arithmetic for grades K-12 at the pre-algebra level. It is an instructional aid for parents, teachers, and educators of primary, elementary, and middle school students, as well as a resource for lesson plans, homework help, and home schooling math lessons. The tutorial includes games, puzzles, interactive diagrams, and computer animated virtual manipulatives that emphasize active learning concepts by visualization.