Minimise subject to Z = 2x1 + x2 x1 + x2 6 |x1x 2 x1 0, 0. (a) Is the problem an LP problem in its current form? Explain your answer. (b) Sketch the feasible region. (c) Convert the optimization problem into a standard LP problem. Then, solve the problem using simplex method (algebraically). [Hint: x b is equivalent to -b x b.] 2