Tentukan persamaan garis melalui (4,-2) dan (1,7)

Bab Persamaan Garis
Matematika SMP Kelas VIII

(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - (-2)) / (7 - (-2)) = (x - 4) / (1 - 4)
(-3) . (y + 2) = 5 . (x - 4)
-3y - 6 = 5x - 20
-6 + 20 = 5x + 3y
5x + 3y = 14

y-y1 / y2-y1 = x-x1/x2-x1

y+2 / 7+2 = x-4/1-4
y+2 / 9 = x-4/-3
-3(y+2) = 9(x-4)
-3y - 6 = 9x - 36
-3y = 9x - 36 + 6
-3y = 9x - 30
y = -3x + 10

#semoga membantu....