book Maths Puzzle Numerical Ability

x^-1+y^-1?x^-1y Can you help me simplify?

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book Other Question

if abc+def=ghi, and adg+beh=cfi then what do variables a-i equal? each variable must have the same value for both problems and only numbers 1-9. variables shown equal hundreds not Which system(s)of equations has no solution?
1. y = 3x - 1 and y = 3x + 1
2.x + y = 1 and y = -x + 3
3. y = 1.5x - 2 and y = 3/2 X + 2
4. 2X + Y = 4X + 2