book Maths Puzzle Numerical Ability

I need help solving this problem, please. I haven't taken math in years and I don't even know where to begin. Thanks in advance.

2-(8y-t)/4y+(7y+6t)/3y

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book Other Question

How can I simplify this equation to easily find the solutions for x and y to this equation:

x*y = (x+y)*(x+y-1)/4

Thanks I'm studying for a math placement test and haven't done Algebra in 15 years. I'm totally stumped on this one:

For all x>0 and y>0, the radical expression: sq. root of x / 3 tim