If we double each side of the second equation, 2x+y=8, we have 4x+2y=16. Explain why the same (x, y) pair that is the solution to the system is also a solution to this new equation. If needed, you can support your solution by inventing a situation that the equations represent.

David must install fencing around a lot that is shaped like a right angle. the side of lot that runs east-west is 200 ft long. the side of the lot runs north-south is 125 ft long. calculate how many feet of fencing he will need to surround the entire lot.

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

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