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kalo salah maaf ya
jadi persamaan y-y1/y2-y1 = x-x1/x2-x1
y-2/3-2 = x-3/-1-3
y-2/-1=x-3/-4
lalu kali silang
-4(y-2)=-1(x-3)
-4y+8= -x+3
x-4y+8-3=0
x-4y+5=0
/=per