I HAVE AN ASSIGNMENT WHERE I HAVE TO PLOT POINTS ON A GRAPH IN EXCEL, THE INFORMATION GIVEN IS QS=2P-20 AND QD=80-2P AND I WAS TOLD TO USE PRICES 10,20,30,40,50 AND QUANTITIES 5,10,15,20,25,30,35,40 FOR THE GRAPH. I HAVE NO CLUE WHAT TO DO FOR THE CHART IN EXCEL