Answer-
Slope-intercept form the line is,

Solution-
The general slope intercept formula of a line is,

Where,
m = slope of the line
c = y - intercept of the line
But, in this case, the coordinate of a point and y-intercept is given. As both the points i.e the given point and the y-intercept lie on the line, we can get the equation the line by two point formula, i.e

Taking (2, -4) and (0, -2) as two points,





Comparing this equation with the slope-intercept equation, we get that m = slope = -2 and y = -2 (as given)
So this equation is the slope intercept form of the line.