Elimination Add or Subtract
Authored by Anthony Clark
Mathematics
9th Grade
CCSS covered
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Solve the system by elimination.
−8x − 10y = 20
−8x − 6y = −4
Infinite number of solutions
(6, 5)
(−6, −5)
(5, −6)
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Solve by elimination
-6x + 5y = 1
6x + 4y = -10
(-1,7/5)
(0,-1)
(1,1)
(-1,-1)
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Solve by elimination:
-9x - 4y = -20
5x + 4y = 4
(-4,4)
(4,4)
(4,-4)
(-4,-4)
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Solve by elimination:
7x + y = -9
-3x - y = 5
No solution
(1,8)
(-1,-3)
(-1,-2)
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
5.
OPEN ENDED QUESTION
1 min • 1 pt
How do you know if you should ADD or SUBTRACT the two equations?
Evaluate responses using AI:
OFF
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Consider the system of equations:
6x-10y=2
6x+2y=24
Should we add or subtract to eliminate a variable?
ADD, because the 6s have the same sign
SUBTRACT, because the 6s have the same sign
ADD, because the 6s have OPPOSITE signs
SUBTRACT, because the 6s have opposite signs
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Consider the system of equations: 2x+4y=10 12x-4y=20 Should we add or subtract to eliminate a variable?
ADD, because the 4s have the same sign
SUBTRACT, because the 4s have the same sign
ADD, because the 4s have OPPOSITE signs
SUBTRACT, because the 4s have opposite signs
Tags
CCSS.8.EE.C.8B
CCSS.HSA.REI.C.6
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