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Verified answer
Bab Persamaan GarisMatematika SMP Kelas VIII
ax + by + c = 0, tegak lurus, (p, q)
bx - ay - (bp - aq) = 0
4x - 6y + 12 = 0, tegak lurus, (12, -18)
-6x - 4y - (-6 . 12 - 4 . (-18)) = 0
-6x - 4y - (-72 + 72) = 0
-6x - 4y = 0
3x + 2y = 0