book Maths Puzzle Numerical Ability

The problem I'm having trouble with is

If x = �1 and y = 2, what is the value of the expression 2x3(thats cubed) � 3xy ?

I understand how to substiture the numbers in, but

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book Other Question

1.Solve each inequality. State the solution set using interval notation and graph the solution set. Is this possible in this day and age! How do I graph these inequalities.

a. how do i solve: 1/8(16y+8)-17= -1/4(8y-16)
i need a step by step answer