Book Maths Puzzle Algebra

In systems of equations...solve by substitution:

-7/2x-y=-18

8x^2-2y^3=0

I can solve by graphing the 2 equations, but, can not solve it algebraicly. Thanks.

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Book Other Question

State the Value of the Discriminant Determine the # of real roots in the question. 4n^2+9=12n Find two consecutive EVEN integers whose product is 120. I know the answer but not how to solve it and show the work!