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Before We Get Started
REMEMBER TO ALWAYS BE RESPECTFUL!
NO food or drinks are allowed.
• Please put your gum into the trash.
NO electronics are allowed.
• Please put away cell phones and music players.
"Wise men speak because they have something to say;
fools because they have to say something.” - Plato
Yesterday’s Homework
1. Any questions?
2. Please pass your homework to the front.
• Make sure the correct heading is on your paper.
• Is your NAME on your paper?
• Make sure the homework is 100% complete.
• Incomplete work will NOT be accepted.
What Do Notes Look Like?
• Heading
• Date
• Section # and Title
• IWBAT (I will be able to)
• Warm-Up
• Notes
• You do not have to copy
the text in blue!
• Class Work
• Summary
Heading
4/9/2016
6.3A Solving Systems by
Elimination (opposites)
IWBAT: solve a linear system by
elimination when already having
opposites. (CA St. 9)
Standard 9: Students solve a system of two linear
equations in two variables algebraically and are able
to interpret the answer graphically. Students are able
to solve a system of two linear inequalities in two
variables and to sketch the solution sets.
Warm-Up
Solve the system by substitution.
1.
x 3
2 x 4 y 6
2x 4 y 6
2 3 4 y 6
6 4 y 6
6
6
4 y 12
4
4
y3
3, 3
2.
y 2x
3x 4 y 10
3x 4 y 10
3x 4 2x 10
3x 8x 10
5x 10
5 5
x2
y 2x
y 2 2
y4
2, 4
Notes
• Solving a System by Elimination
1. Arrange the like variables in columns.
- This is already done.
2. Pick a variable, x or y, and make the two equations
opposites using multiplication.
3. Add the equations together (eliminating a variable)
and solve for the remaining variable.
4. Substitute the answer into one of the ORIGINAL
equations and solve.
5. Check your solution.
Notes
Solve the system by linear combination.
Ex.
2x y 5
2 x 3 y 7
4 y 12
4
2x y 5
2x 3 5
3 3
2x 2
2 2
x 1
4
y3
1, 3
1) Arrange
the variables.
2) Make
opposites.
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Notes
Solve the system by linear combination.
Ex.
2x y 5
2 x 3 y 7
1, 3
Check
2x y 5
2 1 3 5
23 5
55
2 x 3 y 7
2 1 3 3 7
2 9 7
77
1) Arrange
the variables.
2) Make
opposites.
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Notes
Now you try.
Solve the system by linear combination.
Ex.
5 x 4 y 6
3x 4 y 2
2 x 4
2
2
x 2
1) Arrange
the variables.
2) Make
opposites.
5 x 4 y 6
5 2 4 y 6
10 4 y 6
10
10
4y 4
4 4
y 1
2, 1
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Notes
Solve the system by linear combination.
Ex.
5 x 4 y 6
3x 4 y 2
2, 1
Check
5 x 4 y 6
5 2 4 1 6
10 4 6
6 6
3x 4 y 2
3 2 4 1 2
64 2
22
1) Arrange
the variables.
2) Make
opposites.
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Notes
Now you try.
Solve the system by linear combination.
Ex.
3x 5 y 2
3x 6 y 6
1y 4
1 1
y 4
1) Arrange
the variables.
2) Make
opposites.
3x 5 y 2
3x 5 4 2
3x 20 2
20 20
3x 18
3
6, 4
3
x 6
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Notes
Solve the system by linear combination.
Ex.
3x 5 y 2
3x 6 y 6
6, 4
Check
3x 5 y 2
3 6 5 4 2
18 20 2
2 2
3x 6 y 6
3 6 6 4 6
18 24 6
66
1) Arrange
the variables.
2) Make
opposites.
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Notes
Solve the system by linear combination.
Ex.
6 x 7 y 10
6 x 7 y 10
00
Infinite Solutions
1) Arrange
the variables.
2) Make
opposites.
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Notes
Now you try.
Solve the system by linear combination.
Ex.
5x 8 y 9
5 x 8 y 2
0 11
No Solution
1) Arrange
the variables.
2) Make
opposites.
3) Add and
solve for the
variable.
4) Substitute
into ANY
original
equation.
5) Check your
answer.
Class Work
Solve the system by linear combination.
2x 5 y 2
x 4 y 1
1.
2.
3.
2 x 3 y 18
x y 2
6, 2
3, 1
x 2 y 5
5 x 6 y 4
4.
5.
6.
3x 2 y 11
2x 6 y 2
2, 1
3, 1
6 x 2 y 2
3x y 13
7.
8.
9.
6 x 2 y 4
4 x y 16
3, 4
No Solution
10.
3x y 7
x y 1
4, 5
11.
2 x 2 y 18
12.
2 x y 9
6, 3
4 x 3 y 7
4 x 2 y 2
1, 1
3x y 14
2 x y 1
3, 5
5 x 4 y 13
5 x 4 y 13
Infinite Solutions
5 x 2 y 16
x 2 y 8
4, 2
Summary
Write a summary about today’s lesson.
opposites
When a linear system already has ________
just add up both equations and solve for one of the
variables. Next plug that solution back into any of the
variable
equations to find the other ________.
original _________
Today’s Homework
Worksheet 6.3A
Rules for Homework
1. Pencil ONLY.
2. Must show all of your work.
• NO WORK = NO CREDIT
3. Must attempt EVERY problem.
4. Always check your answers.
Ticket Out the Door
Complete the Ticket Out the Door without talking!!!!!
Talking = time after the bell!
Put your NAME on the paper.
When finished, turn your paper face DOWN.
Solve the system.
2x 3y 6
2 x 2 y 14
3, 4