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**2.4 Solving Multi-Step Equations**

Indicators: PFA7, PFA8, PFA9 Written by ??? Edited by Eddie Judd, Crestwood Middle School

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**To Solve: Undo the operations by working backward.**

Ex: x + 9 = 6 5 Ask yourself: What is the first thing we are doing to x? The second thing? Recall the order of operations as you answer these questions. dividing by 5 adding 9 To undo these steps, do the opposite operations in opposite order.

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The DO-UNDO chart Use a chart as a shortcut to answering the questions. DO UNDO ÷ ·5 Follow the steps in the ‘undo’ column to isolate the variable. Ex: x + 9 = 6 5 First subtract 9. x = 6 - 9 x = -3 Then multiply by 5. (5) x = -3(5) x = -15

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**Let’s try another! Ex: d - 2 = 7 3 (3) d - 2 = 7(3) d - 2 = 21 +2 +2**

d = 23 Complete the do-undo chart. DO UNDO ·3 ÷ To solve for d: First multiply by 3. Then add 2.

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Here’s a tricky one! Remember to always use the sign in front of the number. DO UNDO ÷ · -7 To solve for a: First subtract 3. Then multiply by -7. Ex: 3 - a = -2 7 3 - a = -2 - a = -5 (-7)(- a) = (-5)(-7) a = 35

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Try a few on your own. 5z + 16 = 51 14n - 8 = 34 4b + 8 = 10 -2

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**The answers: DO UNDO · 5 - 16 +16 ÷ 5 z = 7 DO UNDO · 14 +8 -8 ÷ 14**

· ÷ 5 z = 7 DO UNDO · -8 ÷ 14 n = 3 DO UNDO · · -2 ÷ ÷ 4 b = -7

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**Assignment Page 95 Problems 9-31 all and 33-37 odds Regular Algebra 1**

Page 95 Problems odds, all, and 31,36,37,40-42 Honors Algebra 1

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