A farmer intends to use at least 30 hectares to plant wheat and barley .The number of hectares of wheat should be less than 6 times the number of hectares of barley. The cost of planting per hectares is 4000 shillings for wheat and 10000shillings for barley .the farmer has a maximum of 400000 to spend on planting .he wishes to plant wheat on at least 20 hectares. By letting the number of hectares of which he plants wheat be x and in which he plants barley be y write down inequalities