book Maths Puzzle Numerical Ability

Solve the non-linear system:

1/x + 2/y = 3
2/x + 1/y = 4

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book Other Question

I must find the domain and range for:
f(x) 3x-2 over 4+5x

Domain:
4+5x=0
-4 both sides
=5x=-4
divide 5 both sides
x=-4 over 5

How do I find the range?

Thank You what is the volume + surface area of a cylinder