exam Maths Puzzle Numerical Ability

Subtract and simplify completely:

4y^2-x^2 over x-y subtract -3y^2 over y-x

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exam Other Question

The sales of a new model notebook computer are approximated by:
S(x)=6000-12000e-x/10, where x represents the number of months the computer has been on the market a 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