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y =2/3x-4/3. gradien m=2/3 tegak lurus menjadi m=-3/2
y=mx+,c melalui (-1,3)
3=-3/2 .(-1)+c
3=3/2+c
c=3-3/2
c=6/2-3/2
c=3/2
persamaannya:
y=mx+c
y=-3/2x+3/2
2y=-3x+3
3x+2y-3=0