exam Maths Puzzle Numerical Ability

I need help with the following question:

Between what two consecutive integers is sqrt78?

Thanks!!!!!

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exam Other Question

the sum of 3 digist is 5. The first and last digits are the same. If the middle digit is exchange with the first digit , then the number is 90 less than the original number. Find the original number. solve the system by graphing
x+y=3
x+y= -1

My question is do I just pick a number to plug in for x & y or do I use the 3 and 1 somehow?