Math homework, help.?

5.5x + 7.5 y = 930. 12x + 15 y = 1920. 55x+75y=9300. 11x+15y = 1860. x = 1920 - 1860 = 60. so, he make 60 scissors. the tool company use 330 units of steel and 720 units of aluminum to make 60 scissors. the tool company still has 600 units of steel and 1200 units of aluminum. with those steel and aluminum, the tool company can make 80 pliers. so, the tool company make 60 scissors and 80 pliers in one hour.