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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
2x + y + 5 = 0, tegak lurus, (2, 5)
x - 2y - (1 . 2 - 2 . 5) = 0
x - 2y - (2 - 10) = 0
x - 2y + 8 = 0