Question 954545: In 2 seconds, an elevator travels 40 feet. In 3 seconds, the elevator travels 60 feet. In 4 seconds, the elevator travels 80 feet. Which is an equation that gives the relationship between the number of seconds x and the distance y the elevator travels?
A. y= x / 20
B. y= x + 18
C. y= 40x
D. y= 20x
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! The answer is D) y = 20x
When x = 2 seconds, y = 20x = 20*2 = 40 feet
When x = 3 seconds, y = 20x = 20*3 = 60 feet
When x = 4 seconds, y = 20x = 20*4 = 80 feet
Notice how I plugged each x value in and got the corresponding y value out to confirm the answer.
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