Which situation can be modeled by the equation y = mx + b?

Select one:
a. The volume (y) of a cylindrical tank with a height of 2 feet depends on the radius (x) of the tank.
b. The total income (y) of a worker who earns 8 dollars per hour depends on the number of hours (x) worked.
c. The number of butterflies (y) in a population doubles every month (x).
d. The time (y) it takes a car to travel 100 miles depends on the speed (x) of the car.

2 answers

a) V of cylinder = πr^2 h
for yours y = 4πx , matches y = mx + b if b=0
b) y = 8x , matches y = mx + b if b=0
c) y = 2^x , no match at all
d) y = 100/x , no match
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