Systems of Equations by Elimination Multiplication

Given the system of equations, what would I multiply the first equation by to eliminate the x variable?

• 4

• 2

• 1

• -2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

• The x variable would be easiest to eliminate

• The y variable would be easiest to eliminate

• We would multiply top equation by 2

• Would multiply the bottom equation by 2

• This system has no solution

Tags

CCSS.8.EE.C.8B

Given the following system check ALL that apply:

• The y variable would be easier to eliminate

• The x variable would be easier to eliminate

• Multiply the top equation by -2 to eliminate y

• Multiply the top equation by -2 to eliminate x

• The x coordinate for this system is x = -3

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

To eliminate a variable on the given system would you multiply one equation or both?

• You dont multiply to eliminate variables

• You will multiply one equation

• You will multiply both equations

• No need to multiply

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Say you wanted to eliminate x from the system shown. How would you do it?

• Add the equations without doing any multiplication.

• Multiply the first equation by 2 and the second equation by 3, then add the equations.

• Multiply the first equation by negative 2 and the second equation by 3, then add the equations.

• Multiply the first equation by 3 and the second equation by negative 2, then add the equations.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which of the following could be a correct first step in solving the system shown? Select all that apply.

• Multiply the first equation by 2, then add the result to the third equation.

• Multiply the second equation by 2, then add the result to the third equation.

• Add the first and second equation.

• Add the first and third equation.

• Add the second and third equation.

Solve using Elimination Method:

4x+ 9y = 28

-4x -y = -28

• (-7,0)

• (6,0)

• (-6,0)

• (7,0)

• (6,7)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system of equations using the elimination method: 3x + 2y - z = 6 2x - y + 3z = 4 4x + 3y + 2z = 9

• x = 4/5, y = 2, z = -3/5

• x = 0, y = 0, z = 0

• x = -2/3, y = 1/2, z = 1/4

• x = 1, y = 3, z = 2

Solve using Elimination Method:

x - y = 11

2x + y = 19

• (10,-1)

• (-1,10)

• (3,-4)

• (6,7)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system using elimination.