ax + by = c, tegak lurus, (p, q)
bx - ay = bp - aq
2.5x - 4y = 8, tegak lurus, (20, -1)
-4x - 5y = -4 . 20 - 5 . (-1)
-4x - 5y = -80 + 5
-4x - 5y = -75
-4x + 75 = 5y
y = (-4x + 75) / 5
y = (-4/5) x + 15
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ax + by = c, tegak lurus, (p, q)
bx - ay = bp - aq
2.5x - 4y = 8, tegak lurus, (20, -1)
-4x - 5y = -4 . 20 - 5 . (-1)
-4x - 5y = -80 + 5
-4x - 5y = -75
-4x + 75 = 5y
y = (-4x + 75) / 5
y = (-4/5) x + 15