The document discusses the properties of equality, including the addition, subtraction, multiplication, and division properties. It explains that to solve equations, you must isolate the variable by doing the same operation to both sides of the equation. It also notes that dividing by a fraction means multiplying by its reciprocal. The document provides examples of solving simple equations and checking the answers.

1. Lesson 2­2.notebook October 01, 2012
Lesson 2.2:
*Addition Property of Equality ­ for any real numbers a, b, and c,
if a = b, then a + c = b + c
*Subtraction Property of Equality ­ for any real numbers a, b, and c,
if a = b, then a ­ c = b ­ c
*Multiplication Property of Equality ­ for any real numbers a, b, and
c, if a = b, then ac = bc
*Division Property of Equality ­ for any real numbers a, b, and c,
if a = b, then a/c = b/c
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2. Lesson 2­2.notebook October 01, 2012
*FYI...to solve equations..."ISOLATE THE VARIABLE".
...AND..."what we do to one side of the equation...we must do to
the other" [to keep them equal]
*Also...dividing by a fraction really means....
...multiplying by its "reciprocal"!
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3. Lesson 2­2.notebook October 01, 2012
Lesson 2.2 examples:
Solve each equation. Check your answer.
A) 104 = y ­ 67 Check:
B) 2 n = 10 Check:
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4. Lesson 2­2.notebook October 01, 2012
C) ­61 = d + (­18) Check:
D) ­16 ­ (­t) = ­45 Check:
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5. Lesson 2­2.notebook October 01, 2012
E) 4 1/5 = 3p Check:
F) 2 z Check:
5 45
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