book Maths Puzzle Numerical Ability

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Solve the system by addition.

5x-3y=13
4x-3y=11

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book Other Question

1. What must be true about x, y, z and w if AB = BA for the matrices
A=|x y| ************* B=| 1 1|
|z w| ************* |-1 1| using the formula h= -16t + 20 +300
supose you are standing on top of a 300ft tall building, right next to the edge and you throw a ball straight up in the air.
How long before