book Maths Puzzle Numerical Ability

does the set of ordered pairs{1,2),(2,3),(3,4),(4,5),(5,6),(6,11) define a function?

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how would you do this please show me {4a+2u+i=2
{5a+3u+2i=17
{ a-5u =3
3/(x+1)-1/(1-x)=10/(x^2-1)