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Bab Persamaan Garis
Matematika SMP Kelas VIII

a] (7,-3) dan (3,6)
(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y + 3) / (6 + 3) = (x - 7) / (3 - 7)
-4 (y + 3) = 9 (x - 7)
-4y - 12 = 9x - 63
9x + 4y = 63 - 12
9x + 4y = 51

b] (2,3) gradien 5
y - y1 = m (x - x1)
y - 3 = 5 (x - 2)
y = 5x - 10 + 3
y = 5x - 7

c] sejajar y = -2x + 2, melalui (1,3)
y = -2x + (2 . 1 + 1 . 3)
y = -2x + 5

d] tegak lurus 2x + 6y - 5 = 0, melalui (-2,4)
6x - 2y = 6 . (-2) - 2 . 4
6x - 2y = -12 - 8
6x - 2y = -20
3x - y + 10 = 0