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pertama cari gradiennya (m) terlebih dahulu =
m= -a/b
= -(-3)/1
m= 3
kedua masuk ke persamaan=
(2,1) = (x1, y1)
---> y-y1 = m (x-x1)
y-1 = 3 (x-2)
y-1 = 3x-6
y-1-3x+6 =0
y-3x+5=0 (hasil)