exam Maths Puzzle Numerical Ability

Hi I asked this question before but forgot something How do you figure out the area of an triangle with all sides equal and the only number given is 5 thanks

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Here is my question:


6 - sqrt of 20
-------------- = ?????
2

I came up with 6 - sqrt of 5. I am not sure if this is correct. I need someone to let me know if I am doing this stuff correctly, please.
Please graph for me please

Solve the system by graphing.
3x - y = 1
3x - y = 2