we have the equation
y-5=-2(x+1)
Remember that the equation of the line in point slope form is equal to
y-y1=m(x-x1)
where
m is the slope
(x1,y1) is the given point
Part a) the slope m of the line is m=-2
Part b) the point is (-1,5)
Part c) Convert to slope intercept form
y=mx+b
isolate the variable y
y-5=-2x-2
y=-2x-2+5
y=-2x+3