Additive Identity: value that sums with any number a resulting in a value of a
  *Zero is the additive identity
Multiplicative Identity: multiplication of a and some number resulting in a product of a
  *One is the multiplicative identity
Multiplicative Property of Zero: product of any number and zero is zero
Multiplicative Inverses (aka reciprocals) Property: two numbers whose product is 1

Properties of Equality
• Reflexive: a = a
• Symmetric: if a = b, then b = a
• Transitive: if a = b and b = c, then a = c
• Substitution: if a = b, then a may be replaced by b in any expression

Transitive and Substitution are very similar, so remember:
    Transitive has 2 variables
    Substitution has 1 variable

Example 1: Name the property used in each equation. Then find the value of n.
  A. n*12 = 0




  B. n*(1/5) = 1




  C. 0 + n = 8

Example 2: Name the property of Equality
  A. 2 + 6 = 1 + 7 and 1 + 7 = 8, then 2 + 6 = 8




  B. if 9 + 3 = 12, then 12 = 9 + 3




  C. if p = 4, then 60 = 6*4

Example 3: Evaluate (1/4)(12-8) + 3(15 / 5 - 2). Name the property used in each step.

Homework: p23 #3, 9-11, 12-28 even, 44, 50, 54, 56