x = the weight of one steel ball y = the weight of one brass ball 2x + 5y = 13 (2 + 2)x + (5 - 2)y = 12 by solving the above system of equations we find:
x = 1.5 lbs y =2 lbs one steel ball weighs 1.5 lbs.one brass ball weighs 2 lbs.
I think it's the first one. Two units right and three units down.
In 20 minutes John can rap 10 small boxes and Hank can rap 12 small boxes
