exam Maths Puzzle Numerical Ability

state whether each relation represents a function and why.
{(0,0),(2,5),(3,3)}

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exam Other Question

The sum of two numbers is 25 and the sum of their squares is 313. Find the numbers. (Express one number as x, the other in terms of x).

Thanks. At a particular speed, a jumbo jet can travel its own length in 20 seconds. At the same speed, the jumbo jet taxied completely past a 710 foot long hangar in 70 seconds. What is the length of the jumbo jet?

Thanks for your help.