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Prealgebra Practice Set 45: Solving Basic Equations using the Multiplication Principle of Equality

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Published on May 18, 2011

http:///www.greenemath.com/

In this video, we look at some additional practice problems for our lesson on the multiplication principle of equality. We look at solving some equations in which we use our multiplication principle of equality. We also get into some problems that allow us to use the division principle of equality. The multiplication principle of equality tells us that we can multiply both sides of an equation by the same nonzero number without changing the solution. For example, if I want to solve 1/2 x = 3, I can multiply both sides of the equation by 2/1 and get x=6 as a solution. The division principle of equality tells us that we can divide both sides of an equation by the same nonzero number, without changing the solution. For example, if we want to solve -3x=9, we can divide both sides of the equation by -3 and get x=-3 as our solution.

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