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

point: (5, 9); slope: 2

a. y−9=2(x−5)

b. y−9=2(x+5)

c. y−5=2(x+9)

d. y+9=2(x−5)

The general formula for the equation of the straight line is:
y−b=m(x−a) where
m is the slope 
a is the x coordinate of the given point
b is the y coordinate of the given point

The slope is given as 2
x coordinate in the given point is 5
y coordinate of the given point is 9

Substitute with these values in the mentioned equation as follows:
y−9=2(x-5)