book Maths Puzzle Numerical Ability

Can you please help to answer the following question:
.
Find all positive integers a and b such that:
a^2+b^2-7=ab

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book Other Question

The difference between 1/4 of a number and 1/6 of the same # is 18. Which equation shows the correct relationship?
1.1/4x-1/6x=18
2.1/4x=1/6x=18
3.1/4x+18=1/6x
4.1/6x-18+1/4x=18
5.1/6x-18=1/4x In an endurance race, Alyson rode her bike 7 miles less than Jeff. Together they rode 39 miles. How far did Jeff Ride?