Given the slope and the coordinates of one of points in the line, the equation may be expressed by the slope - intercept form in which the general form is written below.
y - y1 = m(x - x1)
where m is the slope and x1 and y1 are the abscissa and ordinate of the point, respectively.
Substituting the given values,
y - (-3) = -6(x - (-9)
Simplifying the equation gives,
y = -6x -57