Transcript August 22, 2011 Welcome to Ms. Wu`s math class!

Sept. 30, 2011
Ms. Wu says…Get to work! 
1. Copy homework into planner.
2. Work on the warm up individually in pen. When done,
turn into manila folder.
3. Grade HW 1.11 (key below).
________________________________________________
5) 4x + 12
41) P = -24w + 34
6) 8y + 16
A = -108w + 72
7) 5m + 25
17) ¼ m – 2
18) - ¾ p + ¾
33) 8r + 8
34) 14t + 4
37) 10w – 35
40) P = 2v + 16 A = 5v + 15
The Distributive Property
• a (b + c) = ab + ac
• (b + c) a = ba + ca
Super-Evil Mystery Numbers
• PART 1: Find each of the following mystery
numbers. Record in your notes the process
that you followed to find each mystery
number.
• PART 2: Compute the sum of the mystery
numbers. Write the sum in the box and raise
your hand so Ms. Wu can check it.
– If you get the correct sum, you get a sticker!
– One mystery number has a fractional answer.
• PART 3: Create a mystery number problem
like the ones above to try to stump the class!
Mystery Number Stumpers
1. Must be structured like one of the mystery
number problems (written as a word
problem)
2. Must be on a sheet of paper with title and
heading.
3.Must have the corresponding equation and a
solution.
4. Everything must be correct and the problem
has to be challenging!
Equations with Variables on Both
Sides: Additional Examples
• 1) 13x - 5x – 5 = x + 7 + x
3(x – 2) + 3x = 4x - 6
12x + 36 = 2(6x – 10)
5x – 3(x + 2) = 2x - 6
Avoiding Fractions
• ½x+¼=6
• 2/3(x – 4) = 2
Vocabulary
• Solution Set: The set of values that make an
equation true. Denoted S = {answers}
• Empty Set (for no solution): The set
containing nothing. Denoted S = {} or S = {Ø}
• Identity (for infinite solutions): An equation
that is true for every value of the variable (can
write S = {all reals}
Unit 1.2 Common Mistakes
• Not solving equations using the properties of
equality (“golden rule”) and showing inverse
operations line-by-line on both sides
• Ignoring operation signs when combining like
terms.
– Change all subtraction to…
• Forgetting to draw the coordinate axes
• Solving equations by guess and check instead
of algebraically
• Proper formatting for expressions
Quiz Corrections
• Due on the day of the test (10/6 or 10/7)
• All missed problems must be completely
corrected on a separate sheet of paper and
attached to the original quiz.
• Check answers with peers, knowledgeable
adults, or me.
• Can get up to a 20 out of 24.
Homework
• HW 1.12: Solving Equations with
Fractions and Variables on Both Sides
• Pgs 157 -158: 7, 10, 14, 23, 25, 26, 32,
34, 37, 40