C. SUBSTITUTION CAN MAKE THIS TYPE OF PROBLEM EASIER. ASSUME THAT Y...

7. c. Substitution can make this type of problem easier. Assume that you are buying 10 dozen eggs. Ifthis 10 dozen eggs cost $20, then 1 dozen eggs cost $2. This is the result of dividing $20 by 10, which in

y

this problem is . If is the cost of 1 dozen eggs, then if you buy zdozen eggs, the cost is , which

x

×z

x

C

^yz

x

is the same as choice c, .