exam Maths Puzzle Numerical Ability

I need some help PLEASE!!!!

solve each of the following by substitution

8x-4y=16
y=2x-4

Thanks
Heather

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exam Other Question

A college book store marks up the price that it pays the publisher for a book by 35%. If the selling price of a book is 56.00, how muchdid the book store pay for this book? A cube has volume V=s3, where s is the length of a side.

Fill in the blank: The side length for a cube with volume 27000 m3 is

__m3