![]() However, we can subtract from each congruent lines segments.īut first, we need to state that because of the reflective property. Notice that and are more than sides of the triangles. Subtraction Postulate: If equal quantities are subtracted from equal quantities, the differences are equal.Īpplying the subtraction postulate into a proof, let’s look at another example: ![]() Similar to the addition postulate, we now have a subtraction postulate. Now, we have the two side lengths congruent to each other. We can substitute for because of the substitution postulate. Since we already know that, therefore because of the addition postulate since the sum of equal quantities added to equal quantities are equal. We know that because of the reflective property. Note that and aren’t sides of the triangles but rather part of the side length. Mark the congruent lines on the diagram and then write it in a statement-reason proof. We are given the information that and we have to prove that. Let’s look at the diagram given in the video: ![]() Since the sum of 3 and 8 are both 8, we can substitute each expression with 8 and they will still equal to one another. Substitution Postulate: A quantity may be substituted for its equal in any expression. Let’s first learn what these postulates are:Īddition Postulate: If equal quantities are added to equal quantities, the sums are equal. Sometimes the addition, subtraction, & substitution postulates are necessary to prove two angles congruent or two sides congruent. In this video you will learn the addition, subtraction, & substitution postulates and how to use them properly in a logic proof.
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