book Maths Puzzle Numerical Ability

Solve the system.

6y + w = -10

x + y + 3z - w = 13

6x + z + 3w = 14

x + y + 5z = 13

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book Other Question

What is the value of y^3+y^3 ?
is it 2y^3 or y^6?
solve by addition

2/3x - 1/2y=2

1/3x + 1/4y=3

thank you very much