Independent & Dependent Variables

On your bike, you can travel 6 miles per hour. Which variable is independent?

• Distance traveled
• speed of the bike
• Number of hours you ride
• 6 miles

 At the salad bar, the grocery store charges $5.99 for each half pound you buy.  Which variable is dependent?

• weight of the salad 
• total cost of the salad
• cost of salad per pound
• $5.99

 The more time that I spend reading, the more pages I have read. Which variable is independent?

• number of pages 
• time spent reading 
• neither
• both

Mason makes $20 for each lawn he mows. Which equation represents the money he makes, d, in dollars that Mason makes after he mows n lawns?

• d=20n
• n=20d
• d = 20/n
• n = 20+ d

A movie theater charges $8 for all large containers of popcorn. Jeffrey graphs the function that gives the total cost, y, in dollars to buy x containers of popcorn. Which ordered pair is a point on the graph of the function?

• (2, 10)
• (4, 32)
• (16,2)
• (8,1)

 At the farm, each fenced pen holds 5 cows.  How many cows, c, can the farm have for p, pens? What is the dependent variable?

• fences
• farms
• cows
• chickens

A cell phone provider charges $0.15 for each text message sent and received.  What is the independent variable?

• $.15
• total cost
• number of texts
• number of cell phones

Adrien earns $9.25 per hour working at a shoe store.  If Adrien earned $74 last week, which equation would be used to determine h, the number of hours she worked last week?

• a.  9.25 = 74 - h
• a.  74 = 9.25 + h
• a.  9.25 = 74 + h
• a.  74 = 9.25h

Which equation represents these ordered pairs? 
(8,12), (10,14) (12, 16) (14, 18)

• y=2x
• y = x/2
• y=x-4
• y=x+4

For Julie to make 16 muffins, she need 2 cups of flour. To make 32 muffins she needs 4 cups of flour.  What is the dependent variable? 

• number of muffins
• cups of flour
• 16 muffins
• chocolate chips