Intro to Elimination Method

What is the main goal of the elimination method in solving systems of equations?

• To multiply or divide the equations to eliminate both variables.

• To add or subtract the equations to eliminate both variables.

• To eliminate one variable and solve for the remaining variable.

• To substitute one variable and solve for the remaining variable.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What happens when adding or subtracting the equations in the elimination method?

• The goal is to eliminate one variable by making the coefficients of that variable in both equations equal.

• The goal is to eliminate both variables by making the coefficients of both variables in both equations equal.

• The goal is to subtract one equation from the other to create a new equation.

• The goal is to add the equations together to create a new equation.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the first step in the elimination method?

• Add one or both equations.

• Multiply one or both equations by a constant.

• Subtract one or both equations.

• Divide one or both equations by a constant.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the second step in the elimination method?

• Add the two equations together.

• Subtract one equation from the other.

• Multiply one or both of the equations by a constant.

• Divide one equation by the other.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the final step in the elimination method?

• Substitute the found value back into one of the original equations to solve for the other variable.

• Divide one of the equations by a constant.

• Multiply one of the equations by a constant.

• Add the two equations together.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the following system of equations using the elimination method:

2x + 3y = 8

4x - 3y = 10

• x = 3

  y = 2/3

• x = 2

  y = 3

• x = 4

  y = -3

• x = 2

  y = -4/3

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the following system of equations using the elimination method:

3x - 2y = 8

5x + 4y = 6

• x = -2

  y = -6

• x = 5

  y = 4

• x = 2

  y = -1

• x = 3

  y = -2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the following system of equations using the elimination method:

2x + 5y = 9

3x - 5y = 1

• x = -8

  y = -5

• x = -8

  y = 5

• x = 2

  y = 1

• x = 1

  y = 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the following system of equations using the elimination method:

4x - 3y = 5

2x + 3y = 1

• x = 1

  y = 1/3

• x = -1

  y = -1/3

• x = 1

  y = -1/3

• x = 0

  y = 0

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the following system of equations using the elimination method:

3x + 2y = 9

3x - 3y = 4

• x = 11/3

  y = 1

• x = 7/3

  y = 1

• no solution

• x = 35/3

  y = -13

Tags

CCSS.8.EE.C.8B