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The equations of the sides AB, BC and CA...

The equations of the sides AB, BC and CA of a triangle ABC are `x-2=0, y+1=0` and `x + 2y - 4=0` respectively.
What is the equation of the altitude through B on AC?

A

`x - 3y + 1=0`

B

`x - 3y + 4=0`

C

`2x - y + 4=0`

D

`2x-y - 5=0`

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