exam Maths Puzzle Numerical Ability

Can you please help?
Solve the system by substitution or elimination
a)....2/x+3/y=16
-1/x+2/y=6

b)....solve for x
|x...3..|
|2...x+1| }all = DET 16

c)...x^2+y^2=7

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exam Other Question

Find the verticle asymptote of the rational function f(x)= 3x-12 over 4x-2 ok, I have a problem its a fraction (------------- is the bar)

u^6+v^6+2u^6V^6
-----------------
U^3-V^3+u^2v-uv^2

I realy need to know the awnser and how you got it.