What is the solution to the following system? x = –53, y = –2, z = 7 x = –41, y = –2, z = –7 x = –11, y = –2, z = –7 x = 1, y = –2, z = 7

Your question is incomplete, however, below is how to find the price per pound (with examples).

To find the price per pound, you divide this way:  
For example, take this question:
A shop sells 30 pounds of apples for $2, Leah wants to know how many pounds she gets using only $1.
The answer for this will be 15, because