exam Maths Puzzle Numerical Ability

This subject is realy hard for me,

(3a+6)x + y = a
(a*+ a-2)x-y = 2

it says in the book that i have to find out:

1-one answer only
2-there is no answer
3-there is no en

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exam Other Question

Find a value for k so that 9m(squared)- kn(squared) will have the factors 3m + 7n and 3m - 7n.

thanks Divide a^3 b^4 c^6 by a^4 b^2, then divide that by a^2 b^3 d The posted answer is c divided by a^3 b d. How was that obtained. Can you "spell" out the thinking and process that led to that answer?