book Maths Puzzle Numerical Ability

I need to graph the equation y^3+x^2=8. I got as far as y^3=8-x^2, but I don't know what to do further. I don't know what expression I enter for y o obtain the correct graph.

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book Other Question

How many diagonls can be drawn from each vertex of a decagon? The ages of Old and Young total 48. Old is twice as old as Young was
when Old was half as old as Young will be when Young is three times as
old as Old was when Old was three times as old as Young.
How old is Old?