Transcript August 25, 2011 Welcome to Ms. Wu`s math class!

January 3
Ms. Wu says … welcome back!
1) Find your new seat.
2)Get started on the warm up quietly.
New stuff for 2nd semester:
• Warm ups
– Will not be turned in; grade in class; 10% final grade; points
deducted for talking/not doing it/being off-task
• Quicky quizzes
– Every class period; worth 5 – 10 pts; drop 2 lowest scores; if
absent, counts as dropped score
• Late homework
– Name on door for a week; if not crossed off, mandatory tutorials
(call home)
• Homework quizzes
– Worth 10 pts.; can use homework; cannot drop or make up; if
absent, grade homework as quiz
Example #1:
• Bill and his brother collect comic books. Bill
currently has 15 books and adds 2 books to his
collection every month. His brother currently
has 7 books and adds 4 books to his collection
every month. Write 2 equations and use them
to find the number of months (x) after which
Bill and his brother will have the same number
(y) of comic books in their collections.
Equations
• y = 2x + 15 (Bill)
• y = 4x + 7 (brother)
x
0
1
2
3
4
5
Y = 2x + 15
Y = 4x + 7
Vocabulary
• System of linear equations (linear system):
two or more linear equations in the same
variables
• Solution of a linear system: an ordered pair
that satisfies each equation in the system
Solve by substitution
• y = 3x + 2
• x + 2y = 11
Quicky Quiz
• 5 minutes
• Worth 5 points
• No notes allowed
HW 3.1 Solving Systems by
Substitution
• Pgs 439 – 441: 5, 10, 14,
16, 21, 26, 28, 30, 32, 36