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tegak lurus dgn :
3y-5x+12 = 0
y= 5x+12/3
gradiennya koefisien x jadinye
m = 5/3
pers garis :
y-y1 = m(x-x1)
y-(-6) = 5/3(x-5)
y = 5/3x - 25/3 - 6
y =5/3x - 43/3
-5/3x + y + 43/3 = 0
5/3x - y - 43/3 = 0