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The eqution of the side BC,CA and AB of ...

The eqution of the side BC,CA and AB of the triangle ABC are `u_(1)=a_(1)x+b_(1)y+c_(1)=0.u_(2)= a_(2)x +b_(2)y+c_(2)=0 and u_(3) =a_(3) x+ b_(3) y+c_(3)=0` respectively. Prove that the eqution of the straight line through A and paralle to BC is.
`(a_(3)b_(1)-a_(1)b_(3)) u_(2)+(a_(1) b_(2)-a_(2)b_(1))u_(3)=0`

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