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syarat garis saling tegak lurus m1 . m2 = -1
garis 1
x - 3y + 5 = 0
-3y = -x - 5
----------------- (dibagi -3)
y = 1/3 x + 5/3 ( catatan : gradien adalah nilai koefisien x)
m1 = 1/3
garis 2
5x - 3y = 1
-3y = 1 - 5x
--------------- ( dibagi - 3)
y = -1/3 + 5/3 x
m2 = 5/3
m1 = 1/3
m2 = 5/3
kesimpulan kedua garis tidak sejajar ataupun tidak tegak lurus