I'm working on a program that determines if lines intersect. I'm using matrices to do this. I understand all the math concepts, but I'm new to Python and NumPy.

I want to add my slope variables and yint variables to a new matrix. They are all floats. I can't seem to figure out the correct format for entering them. Here's an example:

import numpy as np

x = 2
y = 5
w = 9
z = 12

I understand that if I were to just be entering the raw numbers, it would look something like this:

matr = np.matrix('2 5; 9 12')

My goal, though, is to enter the variable names instead of the ints.