book Maths Puzzle Numerical Ability

how do u factor this out..having trouble: x^3 + 8y^3

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book Other Question

4/R + 9-4R/3R=R/3 WHICH IS THE SOLUTION OF THE SYSTEM GIVEN BELOW?

Y=-X+2
Y=-X-5

A. (2,1) B. (2,5)
C. NO SOLUTION D. INFINITELY MANY SOLUTIONS