NDA Math Coordinate System and Straight Line

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Direction : Consider the following for the next two (02) items that follow.
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.
[NDA-II 2021]
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What is the equation of the altitude through B on AC ?
[NDA-II 2021]
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