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a = 2 dan b = 6
gradien tegak lurus :
m = b/a = 6/2 = 3
maka,
pers.grs.melalui ttk.(-4,-2) dan m = 3 :
y-y1 = m(x-x1)
y-(-2) = 3(x-(-4))
y+2 = 3(x+4)
y+2 = 3x+12
y = 3x+12-2
y = 3x+10
atau
3x-y+10 = 0
atau
3x-y = -10