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m1 =3
m2 = ?
m1 x m2 = -1
3 x m2= -1
m2 =-1/3
persamaan garis lurus :
y - y1 = m(x - x1)
y-8 = -1/3(x+6)
y-8= -1/3x -2
y = -1/3x-2+8
y=-1/3x+6