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In the previous lesson, you became familiar with rules of addition, subtraction, multiplication, and division, and how to apply them to simplify and solve some simple algebraic equations. The substitution rule that you have just learned is one more useful tool to enlarge your mathematical powers. The examples presented here showed pairs of simultaneous linear equations that have two variables. The substitution rule can also be used to solve larger, more complex systems of simultaneous equations, as you will learn in your future study.

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.