The human body has about 5.5 liters of blood 3 deciliters is about 0.3 liters so 5.5/0.3=18.33333 so she could fill 18 and 1/3 glasses before she died wait oooooh, she has a supply of blood other than her own, nvm, I should read better
1 decileter is 1/10 of a liter so 3/10 of a liter per glass
6 of those 2 liter bottles so total is 6*2=12 liters so 3/10 times number of glasses=12 times both sides by 10/3 number of glasses=120/3 number of glasses=40 can fill 40 glasses with the blood she is supplied (not including her own)
The "inverse operation" is just a way of saying "what do you do to isolate the variable". In this case, we isolate y, so we have to move all terms to the right side. To do that, we subtract 12 from each side to there will only be "y" on the left side.
