tentukan gradien garis yg melalui titik A (2,5) dan B (4,-1)

Kelas 8 Matematika
Bab Persamaan Garis

m = (y2 - y1)/(x2 - x1)
m = (-1 - 5)/(4 - 2)
m = -6/2
m = -3

Diketahui :
x1 = 2
x2 = 4
y1 = 5
y2 = -1

Ditanya ;
m = ?

Penyelesaian :
m = (y1 - y2)/(x1 - x2)
    = (5 - (-5))/(2 - 4)
    = 10/(-2)
    = -5