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Verified answer
Bab Persamaan GarisMatematika SMP Kelas VIII
ax + by = c, tegak lurus, (p, q)
bx - ay = bp - aq
x - 2y = 6, tegak lurus, (-4, 3)
-2x - y = -2 . (-4) - 1 . 3
-2x - y = 8 - 3
-2x - y = 5
2x + y = -5