book Maths Puzzle Numerical Ability

Solve for the indicated variable:
2/w - y = z, solve for w

This is how I solved it, I'm I correct?
1/w = z + y/2

Thanks for your help

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book Other Question

Fill in the blanks:

_ _ - ( _ / _ ) =9

the only numbers you can use are 3, 4, 6, 8, and 9

the same goes for this problem:

_ _ / _ + _ _ = 418 Can you help me with this question?
Do I use the pythagorean theorem?? Two planes simultaneously from the airport one flying north and the other east. The northbound plane is fly