Elimination Review

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

 $4x-2y=20$  

 $-8x-3y=16$  

• 4

• 2

• 1

• -2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Given the following system, how many equations would we have to change to eliminate a variable?

 $2x-3y=-6$  
 $-5x-9y=15$  

• One

• Both

• None

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Given the following system check ALL that would apply.

 $5x-3y=-28$  
 $4x+6y=-14$  

• 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

 $3x+6y=6$  
 $9x-12y=18$  
For the given system check ALL that are true.

• Multiply the top equation by -3 to eliminate x

• Multiply the top equation by 2 to eliminate y

• The solution to this system is (0,2)

• The y coordinate for this system is 0

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Given the system of equations, what variable would be the easiest to eliminate?

 $4x-2y=20$  

 $-8x-3y=16$  

• x 

• y 

• either one, they are the same

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

If two lines are parallel, how many solutions do they have?

• 1
• 2
• infinite
• none

Tags

CCSS.8.EE.C.8B

What method would you use to solve the following system of equations?

• solve for y

• Substitution, because there is an equation with an isolated variable

• Elimination with addition

• Elimination with multiplication

• elimination with subtraction

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Because the first equation is solved for y, we will use substitution.

Which of the following represents the correct equation when you substitute y into the equation?

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

• Graphing

• Elimination

• Substitution

• Matrix Method

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6