persamaan garia yg melalui titik (-5,1) dan(5,-5) adalah..

m= y2-y1 / x2-x1
   = -5-1 / 5+1
   =-6 / 6
   =-1
y-y1=m(x-x1)
y-1=-1(x+5)
y-1=-x-5
x+y+4=0