The Elimination Method

Solve the following system by using elimination:

-9x - 2y = -23

-10x - 5y = -20

• (-3, -2)

• (3, 2)

• (3, -2)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Name the method for solving a system of equations by "getting rid of" one of the variables first to solve for the other variable.

• Graphing

• Substitution

• Elimination

• Drawing

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Describe the error in solving this system of equations using the Elimination Method.

• They eliminated the x terms when they should have eliminated the y terms.

• They subtracted 5x and x to get 4x, but they should have added the x terms to get 6x = 24.

• They added 16 and 8 to get 24, but they should have subtracted them to get 8 on the right side of the equation.

• They eliminated the y terms, but they couldn't because one is a negative and one is a positive.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What would be the first step in solving this system using the Elimination Method?

2x + 2y = -2

3x - 2y = 12

• You cannot solve this using the Elimination Method.

• Cross out the 2x and 3x

• Add the like terms. The y terms will cancel out.

• Change to slope intercept form and graph

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the best first step in solving a system of equations by the Elimination Method?

• Get both equations in the Standard Form and line up the like terms.

• Get both equations in graphing form.

• Get both equations equal to zero.

• Eliminate all of the constants.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which is the best method for solving this system of equations?
 - 4x - 2y = - 12
   4x + 8y = - 24

• Substitution

• Elimination

• Transition

• Multiplication

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the resulting combined equation to the following system of equations when using the Elimination Method?

• 8y = 15

• 10y = 15

• 10x = 15

• 25x = 15

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable is the easiest to eliminate in this system?

• x

• y

• both

• neither

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable is the easiest to eliminate in this system?

• x

• y

• both

• neither

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6