input: Write a python function to solve a system of linear equations using numpy.
  assert np.allclose(solve_linear_eqns([[2, 1], [1, 3]], [5, 6]), [2, 1])
  assert np.allclose(solve_linear_eqns([[1, 2, 3], [4, 5, 6], [7, 8, 10]], [6, 15, 25]), [1, 1, 1])
  assert np.allclose(solve_linear_eqns([[3, 1], [1, 2]], [9, 8]), [2, 3])
output: import numpy as np
  
  def solve_linear_eqns(A, b):
      return np.linalg.solve(A, b)