Book Maths Puzzle Number System

Is the following statement true or false?
(Both x and y are not negative numbers.) xy x y =
If it is true, give two examples. If it is false, give a counterexample.

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Book Other Question

16. On a recent Tuesday, 200 adults entered a pet store. They were asked which of three types of pet they
owned.
15 had a bird, a dog, and a cat.
40 had at least a cat and a dog A restaurant charges $3.50 for its all you can eat breakfast buffet, and $5.00 for its lunch buffet. At 2 PM
the manager found that 100 people had eaten in the restaurant that day, and the total receipts were $428.How many people had eaten breakfast and how many had eaten lunch? Solve this problem using any method, however to receive full credit, you must specify which method you are using and show supporting work.