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

Question

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.

Answer 1

a. but I see y = 2 * pi x^2 and x^2 is not x
b. y = 8 x + 0 well that is reasonable
c. y = x initial * 2^n heavens no
d. y = 100 / x well hardly

Answer 2

E