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Verified answer
Bab Persamaan GarisMatematika SMP Kelas VIII
ax + by = c, tegak lurus (p, q)
bx - ay = b . p - a . q
2x - y = (2 . (-1)), tegak lurus (-1, 0)
-x - 2y = (-1 . (-1)) - 2 . 0
-x - 2y = 1
2y = -x - 1
◎◎ B ◎◎
2y = -x - 1
(B)