2015­10­20 systems elimination.notebook
Today is Tues
10/20
Do Now:
-Take out HW
-Take calculator
-Copy down Problem Set
-Quiz on Thursday
Problem Set Solutions
October 20, 2015
2015­10­20 systems elimination.notebook
Lesson 18: Solving linear systems
(algebraically) Part 2
October 20, 2015
2015­10­20 systems elimination.notebook
Solving Systems Method #2
Elimination
-Add vertically to eliminate a variable, solve for the remaining
variable
- Substitute that value into one of the equations and solve for the
other variable.
- Check solution in other equation
2x + 3y = 11
­2x + 5y = 13
October 20, 2015
2015­10­20 systems elimination.notebook
October 20, 2015
Solve each system
7x ­ 2y = 5
­7x + 3y = ­4
4x + 3y = 2
5x + 3y = ­2
Solving a system by creating an equivalent system
Choose a multiple that will eliminate a variable when the two equations are added together. Original System
New System
Solution
2015­10­20 systems elimination.notebook
October 20, 2015
Choose a multiple that will eliminate a variable when the two equations are added together. Original System
New System
Challenge
Solve the following system
Solution
2015­10­20 systems elimination.notebook
October 20, 2015