#! /usr/bin/env python
# -*- coding: utf-8 -*-
"""
Solve a system of simultaneous equation in two variables of the form
    2 * x + 7 * y = 17.
    3 * x - 5 * y = -21.

reference : http://docs.scipy.org/doc/numpy/reference/generated/numpy.linalg.solve.html
"""
#

import numpy as np
a = np.array([[2.,7.],[3.,-5.]])  # coefs matrice  
b = np.array([[17.],[-21.]])   # independent coef vector
print(np.linalg.solve(a,b))  # solution