Math 8: Solving Systems of Equations by Elimination

What is the first step in solving a system of equations by elimination?

• Get both equations in standard form and line up the like terms.
• Get both equations in slope-intercept form.
• Get both equations equal to zero.
• Put the x terms first.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What would be the first step in finding the solution with elimination?

4x + 3y = 1

x - 3y = -11

• cross out the 3y and -3y

• cross out the 4x and x

• change all the signs of the second equation

• add 1 and -11

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

A system of two parallel lines will have how many solutions?

• One Solution
• Two Solutions
• No Solution
• Infinite Solutions

Tags

CCSS.8.EE.C.8B

A system of two identical (overlapping) lines will have how many solutions?

• One Solution
• Two Solutions
• No Solution
• Infinite Solutions

Tags

CCSS.8.EE.C.8A

What is the next step in solving this system by elimination?
2x + 3y = 9
5x + 3y = 21

• Nothing - it is ready to go.
• Multiply one equation by -1
• Multiply the top equation by 3.
• Multiply the bottom equation by 7.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which of the following is NOT a method to solve systems?

• Elimination
• Distribution
• Substitution
• Graphing

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

9x-3y=-3

-5x+3y=-1

Which variable will be eliminated?

• the x

• the y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

10x-8y=-30

-10x+9y=25

Which variable will be eliminated?

• the x

• the y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What would be the first step in finding the solution using elimination?

2x + 2y = -2

3x - 2y = 12

• you cannot solve this using eliminiation

• cross out the 2x and 3x

• cross out the 2y and -2y

• change to slope intercept form and graph

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which variable will be eliminated if you solve the system:

x + 9y = 8

-6x - 9y = -3

• x

• y

• What's a variable

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6