Persamaan garis melalui 3, - 3 tegak lurus garis y =2x + 5

Bab Persamaan Garis
Matematika SMP Kelas VIII

ax + by = c, tegak lurus, (p, q)
bx - ay = bp - aq

y = 2x + 2
2x - y = -2, tegak lurus, (3, -3)
-x - 2y = -1 . 3  - 2 . (-3)
-x - 2y = -3 + 6
-x - 2y = 3
-2y = x + 3
y = (-1/2) x - 3/2