exam Maths Puzzle Numerical Ability

find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n

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exam Other Question

y = 4/2 +1 = ? Solve by the elimination method.

9x-9y=36

7y-3x= -14
What is the solution of the system?
Can someone explain this to me? I do not understand this at all...not of it.