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# 2.5 notes

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### Transcript

• 1. 2.5&#xA0;Algebraic&#xA0;Proofs September&#xA0;12,&#xA0;2011 Bellwork Logic &amp; Reasoning half sheet You need 3 colored pencils and scissors.HW&#xA0;pg.&#xA0;108&#xA0;#3&#xAD;11&#xA0;odd,&#xA0;21&#xAD;25&#xA0;odd,&#xA0;28&#xAD;30 1
• 2. 2.5&#xA0;Algebraic&#xA0;Proofs September&#xA0;12,&#xA0;2011 2.5 Reason Using Properties from Algebra Algebraic Properties of Equality Addition: If a = b, then a + c = b + c Subtraction: If a = b, then a - c = b - c Multiplication: If a = b, then ac = bc Division: If a = b and c &#x2260; 0, then a/c = b/c Substitution: If a=b, then a can be substituted for b in any expressionHW&#xA0;pg.&#xA0;108&#xA0;#3&#xAD;11&#xA0;odd,&#xA0;21&#xAD;25&#xA0;odd,&#xA0;28&#xAD;30 2