kemiringan garis yang melaui titik (4,h) dan (h +3, 7) kemiringan -1per4. tentukan nilai h

(7 - h)/((h + 3) - 4) = - 1/4
(7 - h)/(h - 1) = - 1/4
4(7 - h) = - (h - 1)
28 - 4h = - h + 1
3h = 27
h = 9

-1/4=(7-h)/((h+3)-4); -1/4=(7-h)/(h-1); (-1/4)h+1/4=7-h; (3/4)h=27/4; h=9