exam Maths Puzzle Numerical Ability

In dealing with quadratic equations, how do we determine wheather the solutions are real or complex?

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Can someone help me here?

I need to solve the system by addition or substitution

3x - 4y = 8
6x - 2y = 10

Thanks,
Jamie could you please help me with this:
6/x+3 - 3/x+6 = 4/x+3

Could you show me the steps as well as your answer please?
Thank you