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## Homework Statement

If

l -1 2 l l x l = l 2 l

l 1 -2 l l y l l 1 l

Show that the two lines are parallel and so never cross.

## Homework Equations

## The Attempt at a Solution

I have attempted it, and so far all i have done is find the determentant. When i do this, i get zero:

det = ad - bc

= (-1*-2) - (2*1) = 0

So, is this all I have to do to prove that the lines are parallel?