[Tutor] Help....

[edmundo pierre]

I am trying to write a code to solve a system of equation at 2 variables. I used Tkinter to do it. I disigned everything, but I am just stocked when it comes to display the answer on the screen. 
That is the error I am having:   

Exception in Tkinter callbackTraceback (most recent call last):  File "C:\Users\edwin\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 1699, in __call__    return self.func(*args)  File "C:\Users\edwin\AppData\Local\Programs\Python\Python36-32\ed.py", line 122, in Calculate    z = np.linalg.solve ( a, b)  File "C:\Users\edwin\AppData\Local\Programs\Python\Python36-32\lib\site-packages\numpy\linalg\linalg.py", line 375, in solve    r = gufunc(a, b, signature=signature, extobj=extobj)  File "C:\Users\edwin\AppData\Local\Programs\Python\Python36-32\lib\site-packages\numpy\linalg\linalg.py", line 90, in _raise_linalgerror_singular    raise LinAlgError("Singular matrix")numpy.linalg.linalg.LinAlgError: Singular matrix

Hope to get help. Thank you!
Edwin