Applications of Linear Equations

A plant is 5cm tall and growing at a rate of 3cm a month.

• 5 + 3
• 5x + 3
• 5 + 3x
• 3x-5

A plant is 5cm tall and growing at a rate of 3cm a month. If the plant is 23cm tall, how many months has it grown for?

• 5 months
• 21 months
• 6 months
• 18 months

Bob has $150 in his savings account and saves $40 per month.

• 150 + 40
• 40x + 150
• 150x+40
• 190x

Easy Car Rental charges $8.50 an hour plus a rental fee of $25.50.

• 8.5 + 25.5
• 25.5 + 8.5x
• 8.5 + 25.5x

Write an expression for the following. Jerry has $20 and makes $7 per hour.

• 7x + 20
• 7 + 20x
• 20 + 7

Sonia has $40 in her lunch account and pays $2 each day to eat lunch.

• 40 + 2x
• 40 - 2x
• 2 + 40x
• 2 - 40x

Sonia has $40 in her lunch account and pays $2 each day to eat lunch. y=40-2x. If Sonia has $22 left in her account, how many lunches did she buy?

• 9 lunches
• -9 lunches
• 18 lunches
• -18 lunches

Tags

CCSS.7.EE.B.4A

Sonia has $40 in her lunch account and pays $2 each day to eat lunch. y=40-2x. If Sonia buys 5 lunches, how much money will she have left in her account?

• $3
• $35
• $30
• $15

For lunch, Amanda had a hamburger and some potato chips. The hamburger totaled 325 calories and 12 calories per chip.

• y = 12 + 325
• y = 12x  + 325
• y = 325 - 12x
• y = 325x + 12

Billy's car needed repairs. The mechanic charged him $140 for the parts and an additional $48 each hour for labor. How many hours of labor did the mechanic work on the car if her total bill was $260?

• 3 hours
• 12 hours
• 2.5 hours
• 5 hours