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melalui titik (-2,-1), persamaan grsnya =
y-y1=m(x-x1)
y-(-1)=1(x-(-2))
y+1 =x+2
y=x+2-1
y=x+1
pers grs
y-y1=m(x-x1)
y-(-1)=1(x-(-2))
y+1=x+2
y=x+2-1
y=x+1