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-a/b = -4/-5 = 4/5
sejajar berarti m1=m2, berarti gradiennya sama
y-8 = 4/5(x-6)
y = 4x/5 - 24/5 + 8
dikali 5
5y = 4x - 24 + 40
4x - 5y + 16 = 0
4x - 20 = 5y
5y = 4x - 20
y = 4/5 x - 4
gradien = 4/5
(y - 8) = 4/5 (x -6)
y - 8 = 4/5 (x-6)
y - 8 = 4/5 x - 24/5
y = 4/5 x -24/5 + 8
y = 4/5 x -24/5 + 40/5
y = 4/5 x + 16/5
5y = 4x + 16