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Homework Statement
Say that I have a problem along the lines of: Find the pointnormal equation for the line L.
L=u_{1}+k*u_{2}, where k is ℝ.
And then I'm given u_{1} and u_{2}, which both are 2×1 vectors.
Then L will also be a 2×1 vector (which consists of a_{11} and a_{21}), which I guess is ok (since it gives the two coordinats in R^{2}).
However the pointnormal equation is in the form of (for some constants a and b and some points x_{0} and y_{0} on the line L):
a(xx_{0})+b(y_{0})=0.
So here comes my question: In the vector L: Are a_{11} or a_{21} x?
Homework Equations

The Attempt at a Solution
See above.