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Linear Equations to Solve Problems

Authored by Anthony Clark

Mathematics

8th Grade

CCSS covered

Linear Equations to Solve Problems
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10 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

On Monday Joe bought 10 cups of coffee and 5 doughnuts for his office at the cost of $16.50. On Tuesday he bought 5 cups of coffee and 10 doughnuts for a total of $14.25. Which equations could be used to determine the cost of the coffee?

10c + 5d = 14.25
5c + 10d = 16.50

10c + 5d = 16.50
5c + 10d = 14.25

c + d = 10
5c + 10d = 16.50

c + d = 5
5c + 10d = 16.50

Tags

CCSS.8.EE.C.8C

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the solution to this system of linear equations? 
Use substitution.

y = -2x - 6
-2x + y = 6

(0, -3)

(-3, -12)

(-3, 0)

(3, -12)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the value of x in the solutiont o this system of linear equations?
Use substitution.

y = -3x + 3
- 2x + 2y  = 6

0

No solution

4

- 4

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Solve by elimination:
3x+7y=23

-3x-7y=-17

No solution

ARN

(-3,3)

(3,3)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Solve by elimination:
7x + y = -9
-3x - y = 5

No solution

(1,8)

(-2,-3)

(-1,-2)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

4x +  8y = 20
-4x + 2y = -30
Which variable will be eliminated?

The  x

The  y

The  z

The unknown

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

-6x + 5y = 1
 6x +  4y = -10

(1,-1)

(0,-1)

(1,1)

(-1,-1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

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