book Maths Puzzle Numerical Ability

solve by addition

2/3x - 1/2y=2

1/3x + 1/4y=3

thank you very much

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book Other Question

Solve the system.

6y + w = -10

x + y + 3z - w = 13

6x + z + 3w = 14

x + y + 5z = 13 please help me solve this:

you are going to invest $20,000, part at 12% and part at 16%. what is the most that can be invested at 12% in order to make at least $3000 interest?