Objective 23 Solve two-step equations ©2002 by R. Villar All Rights Reserved.

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Presentation transcript:

Objective 23 Solve two-step equations ©2002 by R. Villar All Rights Reserved

Solve two-step equations How do you solve for a variable when there are more than one operation? Since we are “undoing” the problem, we will do PEMDAS in reverse order... Example 7y – 2 = undo addition/subtraction first 7y = 21 7y = 21 undo multiplication/division last 7 7 y = 3 Be sure to check your solution 7(3) – 2 = – 2 = 19 √

Example: Undo the subtraction first Now, multiply by the reciprocal x = 14 Check: √

Example: Don’t forget that you will need a common denominator (only for the addition part of the problem)... What is the common denominator for 12 and 2? 12 6 Now, multiply by the reciprocal x = – 7 10