book Maths Puzzle Numerical Ability

-200=k+(-99)

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1) 3x-2y=4
2x-5y=21

2) 4x+5y=-5
3x+y=21

3) 3x+y=7
3x+y=10

I cannot find the solutions to these systems. PLEASE HELP! I have to have them due soon! Id any intercepts and asymptotes of the following:

f(x) = 2x-1/x-5