book Maths Puzzle Numerical Ability

How to do these problems radical 5 times radical 30 another problem 10 radical 8 over radical 16 it is on page 565 number 6& 8

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book Other Question

Which system should be used for:

5x-y=1
10x-2y=2
write the equation in standard form:

(2-3x)/y = 5

This is what I came up with:

y = 5(2-3x)

y = 10 - 15x

Any help would be great. Thank you!