'2y 3y 9 21' presentation slideshows

3) Solve for y. Given: AC=21. State the reason that justifies each step.

BELLWORK. 3) Solve for y. Given: AC=21. State the reason that justifies each step. 2y. 3y-9. AB + BC = AC 2y + (3y-9) = 21 5y - 9 = 21 5y = 30 y= 6. Segment addition postulate Substitution property Simplify Addition property of equality Division property of equality. A. B. C.

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2.4 Reasoning in Algebra

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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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