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= (6 + 2)/(- 1 - 3)
= - 2
x1= 3 y1= -2
x2= -1 y2= 6
m= ( y2-y1 ) / ( x2-x1 )
m= (6-(-2) / (-1-3)
m= (6+2) / (-1-3)
m= 8 / -4
m= -2
Jadi, kemiringan garis tersebut adalah -2.