Hello chrisks

Welcome to Math Help Forum!For question 1, you can prove that the determinant is zero. This will prove that its rows are linearly dependent, and hence the scalars exist.

Or you can do it directly with the following system of equations:Multiply by and add to :

Substitute into :

So if we put and , then:

For questions 2 and 3, I'm afraid I don't understand what

means.x1y1-coordinate system

Do you have any more information about this?

Grandad