Tara is carrying the following books in her backpack: a science book that weighs 2 1/2 pound, 2 library books that weigh 3/8 of a pound each, and math book that is half of the weight of her science book

Step-by-step explanation:

Science book weighs = 2 1/2 = 2.5 pounds

Library books weigh = 3/8 = 0.375 pounds

Math book weighs = 2.5 ÷ 2 = 1.25 pounds

Total weight of the books = 2.5 + 0.375 + 1.25 = 4.125 pounds

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.