Solving System of Equations (multiplication)

Solving System of Equations (multplication)

Poll

Who did their homework last night?

• I did!

• I forgot...

• I was too busy and didn't prioritize math.

Solving System of Equations

• Graphing

• Substitution

• Elimination (Addition)

• Elimination (Subtraction

• 
  

  
  

  NOW...

• Elimination (Multiplication)

Recap

get ready

Multiple Choice

What is the best method to use in order to solve this system of equations?

y=2x-4

y=.5x+4

• Graphing

• Substitution

• Elimination

Multiple Choice

What is the best method to use in order to solve this system of equations?

3x+4y=12

x=3y-1

• Graphing

• Substitution

• Elimination

Open Ended

What did we learn about yesterday?

6.4 Elimination

(Multiplication)

Poll

How do we feel about that example?

• Confused

• I kind of understand

• easy

• lets do more

Steps:

• Determine the best method

• Elimination:

• Which variable can be multiplied to equal the like term?

• What do you need to multiply by?

• Multiply the ENTIRE equation

• Cancel out one variable

• continue "normal" steps for elimination

Together:

5x+6y = -8

2x+3y = -5

Multiple Choice

You try:

6x-2y=10

3x-7y=-19

• (3,4)

• (-3,4)

• (4,3)

• I don't know

Lets try together:

9r+q=13

3r+2q=-4

Multiple Choice

x+y=2

-3x+4y=15

• (1,3)

• I don't know

• (-1,3)

• (3,1)