Basic Algebra

12 - y = 7

y = ...

y - 10 = 2

y = ...

Suppose that the water level of a river is 34 feet and that it is receding at a rate of 0.5 foot per day. Match the parts of the equation with what they represent.

• Original Water Level

• 0.5

• Rate that water was receding

• L

• Number of days

• d

• Ending Water Level

• 34

Rufus collected 100 pounds of aluminum cans to recycle. He plans to collect an additional 25 pounds each week. Match the parts of the equation with what they represent.

• pounds per week

• w

• total amount of aluminum cans

• 25

• initial amount of aluminum cans

• 100

• number of weeks

• P

A water tank already contains 55 gallons of water when Baxter begins to fill it. Water flows into the tank at a rate of 8 gallons per minute. Match the parts of the equation with what they represent.

• number of minutes

• 8

• initial amount of water in the tank

• x

• total gallons of water in the tank

• y

• rate that water flows into tank (gallons per minute)

• 55

• cost per video

• 2.50

• membership fee

• 20

• number of videos

• x

• total cost

• y

T-shirts at a flea market cost $4.50 each and shorts cost $6 each. You have $108. Match the parts of the equation with what they represent.

• number of t-shirts

• 4.50

• cost of 1 t-shirt

• x

• cost of 1 pair of shorts

• 108

• number of shorts

• y

• total cost

• 6

You have $30 to spend on downloading songs for your iPod. Company A charges $0.79 per song, and Company B charges $0.99 per song. Match the parts of the equation with what they represent.

• total amount spent on songs

• 30

• cost per song from Company B

• x

• number of songs from Company A

• 0.79

• number of songs from Company B

• y

• cost per song from Company A

• 0.99

You have $6 to spend on lunch today. The drinks cost $1.25 each and the salad costs $0.20 per ounce. Match the parts of the equation with what they represent.

• cost per dring

• 6

• number of drinks

• 1.25

• cost per ounce of salad

• y

• total amount spent on lunch

• 0.20

• number of ounces of salad

• x

Your digital camera has a 512 megabyte memory card. You take pictures at two resolutions, a low resolution requiring 4 megabytes of memory per photo and a high resolution requiring 8 megabytes of memory per photo. Match the parts of the equation with what they represent.

• number of low resolution pictures

• x

• total memory

• 8

• megabytes per high resolution picture

• y

• number of high resolution pictures

• 512

• megabytes per low resolution picture

• 4