Intro to Solving Equations with Elimination

What type of methods did we see last week?

• Graphing

  Method

• Line

  Method

• Substitution

  Method

• Dividing

  Method

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Now we will see Elimination Method! What does "Elimination" mean?

Answer explanation

"Eliminate" looks like "Eliminar", which means "to get rid of".

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the result?

• 5x

• 1x (or x)

• -6x

Tags

CCSS.7.EE.A.1

What is the answer here?

• -10y

• 3y

• 7y

Tags

CCSS.7.EE.A.1

Let's put it together! What would the result be?

• -6x - 10y

• 1x + 3y

  (x + 3y)

• 5x + 7x

Tags

CCSS.HSA.APR.A.1

What is the result of this?

• 6x - 3y

• 40x + 4y

• 14x + 5y

Tags

CCSS.HSA.APR.A.1

What is the best answer for this?

• -13x

• -x - 16y

• 42x - 40y

Tags

CCSS.HSA.APR.A.1

Let's add one more term! What is the best answer now?

• -13x = -52

• -x + 16y = -12

• 42x - 40y = 640

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

If -13x = -52, then what is x?

Tags

CCSS.6.EE.B.7

Okay, now: Equation #1 and #2 have to match.

What can we do so that they match?

• Let's subtract so that we can get matching numbers!

• Let's multiply #2 by 2 to match #1!

• Let's add so we can get matching numbers!

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6