exam Maths Puzzle Numerical Ability

Please help me.

I have simplified the equation: 2/5-y/y-2. I got -3y+4/5(y-2). Is it correct? Can it be further simplified?

Thanks

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exam Other Question

What is the slope of the line described by this equation: P = 3 - (1/6)Q? The variable P is plotted on the vertical axis, and the variable Q is plotted on the horizontal axis. For any positive number a,b,m,n satisfying the condition

m/n = a /(a+b) the difference a/b - m/n is equal to

a) nb / ma
b) mb / na
c) ma / nb
d) ab / mn