- #1

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Let us suppose a line ax+by=0.

This means

**A.B = 0**with

**A**and

**B**being vectors, where

**A**= [a,b] and

**B**= [x,y].

Therefore,

**A**is perpendicular to

**B.**

Now my question is if

**A**is also perpendicular to line ax+by=0 (I'm not sure if this makes sense).

I read this statement in a book and I'm not able to understand how this came to be.

Please help me understand this.

Thanks in advance.