If a line has a slope of 2 and contains the point (-2, 1), what is its equation in point-slope form?
a. y - 1 = 2(x - 2)
b. y - 1 = 2(x + 2)
c. y + 2 = -2(x - 1)
d. y - 2 = -2(x - 1)

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?