Generate a python method to solve the given system of linear equations.
2x - 3y = 6 ; 3x + 4y = 12
def solve_linear_eq(a,b,c,d):
    x = (b*d - c*a) / (b*d - c*a)
    y = (d*a - b*c) / (b*d - c*a)
    return x, y