exam Maths Puzzle Numerical Ability

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The product of two number is 442. The sum of the numbers is 43.

x*n=442
x+n=43

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I need help in finding K so that there is no solution.

x+3y=K
kx+y=-1

this is what I have done
x=k-3y
kx=-1-y
k(k-3y)=-1-y
K^2-3ky=-1-y
k^2=3ky-1-y
k^2=3k-1 simplifly the following :


1) 3x^3 y^4 z^-2 / 6x^-1 y^3 z^-3



2)36^1/2 / 15^2