book Maths Puzzle Numerical Ability

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

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book Other Question

(6d+3a)-(4d-7a) Solve the system.

6y + w = -10

x + y + 3z - w = 13

6x + z + 3w = 14

x + y + 5z = 13