Elimination Systems What to Multiply
Authored by Anthony Clark
Mathematics
9th Grade
CCSS covered
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11 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the proper set up to solve the equation?
-7x -2y= -13
x = 2y+11
-7(11) -2y = -13
-7(2y +11)-2y = -13
-7x -2(11) =-13
-7x - 2(2y+11)= -13
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
2.
MULTIPLE CHOICE QUESTION
1 min • 12 pts
Solve the system:
x+ 3y = 9
2x+ y = −2
(3,2)
(-2, 2)
(3, -4)
(-3, 4)
(0.5, -3)
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
3.
MULTIPLE CHOICE QUESTION
1 min • 12 pts
Solve for x and y
3x + 2y = 16
7x + y = 19
(-2,5)
(-2,-5)
(2,-5)
(2,5)
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
To eliminate the x variables
multiple the top equation by -1
multiply the bottom equation by 4
multiply the bottom equation by -4
multiply the bottom equation by -1
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
5.
MULTIPLE SELECT QUESTION
1 min • 1 pt
To solve this by elimination, which of the follow answer choices show an accurate strategy that will eliminate a variable.
Multiply the top equation by -3 and then add the equations together.
multiply the top equation by -3 and multiply the bottom equation by +5. Then, add the equations together.
multiply the top equation by +9 and multiply the bottom equation by -4. Then, add the equations together.
multiply the top equation by 9 and multiply the bottom equation by 4. Then, add the equations together.
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If you add these equations together which variable is going to eliminate?
x
y
4
Answer explanation
-4x + 4x = 0x = 0
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
After you eliminate the x variables, you can solve for y. Do it! What do you get?
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
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