kemiringan garis yg melalui titik (4,h) dan (h+3,7) kemiringan -1/4 tentukan nilai h.

[tex]\displaystyle m=\frac{y_2-y_1}{x_2-x_1} \\ -\frac{1}{4}=\frac{7-h}{(h+3)-4} \\ -\frac{1}{4}=\frac{7-h}{h-1} \\ -1(h-1)=4(7-h) \\ 1-h=28-4h \\ -h+4h=28-1 \\ 3h=27 \\ h=9[/tex]

kemiringan = (y2-y1) / (x2-x1)
-1/4 = (7-h) / (h+3 - 4)
-1/4 = (7 - h)/ (h - 1)
-1 (h-1) = 4(7-h)
-h + 1 = 28 - 4h
3 h = 27
h = 9