8th Grade Equations: Mastering Variables & Graphs

A store sells pencils for $0.50 each. If you buy x pencils, write an equation to represent the total cost. How much would 10 pencils cost?

• $7.50

• $10.00

• $2.00

• $5.00

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

The perimeter of a rectangle is 50 meters. If the length is represented by x and the width is 10 meters, write an equation to find x. What is the length of the rectangle?

• 20 meters

• 12 meters

• 15 meters

• 18 meters

Tags

CCSS.7.EE.B.4A

A car travels at a speed of 60 miles per hour. Write an equation to represent the distance d traveled after t hours. How far does the car travel in 3 hours?

• 240 miles

• 120 miles

• 150 miles

• 180 miles

Tags

CCSS.HSF-BF.A.1A

A school is planning a field trip and needs to raise $300. If each student contributes x dollars, write an equation to find how many students are needed if each contributes $15. How many students are required?

• 30

• 20

• 25

• 15

Tags

CCSS.6.EE.B.7

The equation y = 2x + 3 represents a line. What is the y-value when x = 4?

• 15

• 11

• 9

• 7

Tags

CCSS.HSF.IF.A.2

A phone plan charges a monthly fee of $30 plus $0.10 per text message sent. Write an equation for the total cost C based on the number of text messages m. How much would it cost if you send 100 messages?

• $70

• $50

• $30

• $40

Tags

CCSS.HSF-BF.A.1A

The equation y = -3x + 12 represents a line. Graph this equation and identify the y-intercept and slope.

• Slope: -3, Y-intercept: 12

• Slope: -12, Y-intercept: 3

• Slope: 3, Y-intercept: 12

• Slope: 0, Y-intercept: 12

A swimming pool is being filled with water at a rate of 5 gallons per minute. Write an equation to represent the total gallons of water w after t minutes. How many gallons will be in the pool after 20 minutes?

• 80 gallons

• 120 gallons

• 100 gallons

• 50 gallons

Tags

CCSS.HSF-BF.A.1A

A concert hall has a seating capacity of 500. If x tickets are sold, write an equation to represent the number of tickets left. How many tickets are left if 350 tickets are sold?

• 150

• 100

• 200

• 400

Tags

CCSS.6.EE.B.7