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melalui titik:(3,-4) dan (-1,2)
x1,y1 x2,y2
m1=y2-y1
------
x2-x1
2-(-4)
---------
-1-3
6
-
-4
m2=》 m1×m2=-1
6/-4 × m2=-1
m2=-1: 6/-4
m2=-4/6=-2/3
cari c=》y=m2x+c
(-4,-3) -3=-2/3(-4)+c
-3=-8/3
-8/3×-3=c
-8=c
pers garis=》y=mx+c
y=-2/3x-8
----------------------×3
3y=-2x-24
3y+2x+24=0
x,y