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p=(3,4) y q=(2,1)
((x-x1)/(x2-x1))=((y-y1)/(y2-y1))
((x-3)/(2-3))=((y-4)/(1-4))
(x-3)/-1=(y-4)/-3
-3(x-3)=-1(y-4)
-3x+9=-y+4
-3x+y+9-4=0
-3x+y+5=0
saludos