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2x 10 139 - PowerPoint PPT Presentation

2-4 Reasoning in Algebra

2-4 Reasoning in Algebra. Ex. 1 Justifying Steps. 1 . angle addition post. 2. substitution 3. simplify 4 . subtraction prop of = 5. division prop of =. Solve for x and justify 1. m<AOB + m<BOC = m<AOC 2. x + 2x + 10 = 139 3. 3x + 10 = 139 4. 3x = 129 5. x = 43. Ex. 1 Cont.

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2x 10 139 - PowerPoint PPT Presentation

2-4 Reasoning in Algebra