January 3 Ms. Wu says … welcome back! 1) Find your new seat. 2)Get started on the warm up quietly.

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January 3 Ms. Wu says … welcome back! 1) Find your new seat. 2)Get started on the warm up quietly.

New stuff for 2 nd 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) xY = 2x + 15Y = 4x

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