Tentukan persamaan garis jika melalui titik (1,-1)dan (3,5)

Bab Persamaan Garis
Matematika SMP Kelas VIII

(1, -1) dan (3,5)

(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
(y + 1)/(5 + 1) = (x - 1)/(3 - 1)
2 (y + 1) = 6 (x - 1)
2y + 2 = 6x - 6
2y = 6x - 6 + 2
y = (6x - 4)/2
y = 3x - 2