Math 8 Final Review

Find the Error
What error did the student make when solving the equation:
1/5x + 6 = 3/5x + 5
1x + 6 = 3x + 5
-2x + 6 = 5
-2x = -1
x = 1/2

• The student found an incorrect common denominator
• The student did not multiply all terms by the common denominator
• The student did not use opposite operations appropriately
• The student did not correctly eliminate the variable from one side of the equation

Tags

CCSS.8.EE.C.7B

Solve the following for x: 0.4x + 1.6 = -1.6x + 53.2

• 25.8

• -25.8

• 27.4

• 54.8

solve for m

• -15
• 15
• 30
• -30

Solve for y:
5x + y = -10

• y = 5x + 10
• y = -5x - 10
• y = 2
• y = -5

Tags

CCSS.6.EE.C.9

Solve for y:
2x + 2y = 6

• y = - x + 3
• y = x + 3
• y = 2x +6
• y = - 2x + 6

Tags

CCSS.6.EE.C.9

Solve for y:
7x+ 2y = 20

• y= 7/2x + 10
• y=-7/2x + 10
• y=2/7 x- 10
• y= -2/7x + 10

Tags

CCSS.6.EE.C.9

When a tow truck is called, the cost of the service is $10 plus $1 per mile that the car must be towed. Write a linear equation to represent the total cost of the towing service.

• y= 10x +1

• y= x +10

• y= -10x + 1

• y= -x +10

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

When a plumber is called, the cost of the service call is $50 for him to show up at your house, plus an additional $25 per hour. Write a linear equation.

• y=50x + 25

• y= 25x + 50

• y= -25x - 50

• y= -50x -25

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Suppose a town has a population of 5,000 residents but that the population is decreasing by 200 people each year. Write a linear equation for this situation.

• y= -200x + 5000

• y= -5000x + 200

• y= 200x + 5000

• y= 5000x+ 200

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2