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**Solving Two- Step Equations**

Lesson 2-2

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Rules to Remember When solving an equation, the goal is to get the variable by itself. Addition and Subtraction are inverse operations. (opposites) Multiplication and Division are inverse operations. (opposites)

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Don’t Forget The equation is like a balance scale. Whatever you do to one side of the equation must be done to the other side of the equation.

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**How to solve two-step equations**

“Undo” the operations in the reverse order of the order of operations. You are using the work back-words strategy In order of operations we do multiplication or division first, then addition and subtraction. When solving an equation we do the opposite!

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**Let’s Try One… 3x + 2 = 23 - 2 -2 21 3x = 21 3 3 x = 7**

21 3x = 21 x = 7 The problem contains addition and multiplication. Which one do we undo 1st?

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**Another Example -2y – 7 = 3 +7 +7 10 -2y = 10 -2 -2 y = -5**

10 -2y = 10 y = -5 The problem contains subtraction and multiplication. Which one do we undo 1st?

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**Last Example -3c + 9 = 3 -9 -9 -6 -3c = -6 -3 -3 c = 2**

-6 -3c = -6 c = 2 The problem contains addition and multiplication. Which one do we undo 1st?

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Now it’s your turn 5x + 4 = 19 -4w – 4 = 8

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Homework Complete Lesson 2-2 pg. 84 # 2-34 EOE and 44-47

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