Line y + 4 = 0 is the horizontal line line y = -4, parallel to x-axis. Any line parallel to it, has an equation y = c, where "c" is a constant term. Since the requested line should go through the point (9,-9) with y-coordinate -9, this requested line has an equation y = -9. ANSWER This equation is in its slope-intercept form, very unique and specific for this special line.