linear programming

hello, in the exam how will the qtns come? like see im good with formulating the base equations and the objective function, finsing the iso contributon line, and then solving the optimal solution point equations. the problem i am having is creating my feasible region when i am drawing the paper, eventhoug the equations for my feasible region are correct, while identifying the feasible region im making a mistake like i am inlcuding some area which has been excluded in the solution, i wish i could show u here my drawing my we cant upload pics. so my question is in the exam will they already give us the feasible region highlighted , nd should we just solve the equations to find the optimal production? or should we identify the feasible region ourselves?