Which answer is an equation in point-slope form for the given point and slope?


Point: (1,-9); Slope: 2


a. y + 9 = 2 (x - 1)
b. y - 9 = 2 (x + 1)
c. y + 9 = 2 (x + 1)
d. y - 9 = 2 (x - 1)​