Consider two equations for the two unknowns x1 and x2:
a11 x1 + a12 x2 = b1
a21 x1 + a22 x2 = b2
where a11, a12, a21, a22, b1 and b2 are given. Solve these
equations for x1 and x2 and write a routine called
that implements the solution of these equations.
You should decide what data go into and come out of this routine.
Also, write a main routine that reads the necessary data from a
file called and writes the solution to a file called .