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Bab Persamaan GarisMatematika SMP Kelas VIII
a] Sejajar
ax + by + c = 0, sejajar, (p, q)
ax + by - (ap + bq) = 0
-x + 2y + 5 = 0, sejajar, (-5, 2)
-x + 2y - (-1 . (-5) + 2 . 2) = 0
-x + 2y - (5 + 4) = 0
-x + 2y - 9 = 0
b] ax + by + c = 0, tegak lurus, (p, q)
bx - ay - (bp - aq) = 0
-x + 4y + 1 = 0, tegak lurus, (3, 4)
4x + y - (4 . 3 + 1 . 4) = 0
4x + y - (12 + 4) = 0
4x + y - 16 = 0