book Maths Puzzle Numerical Ability

how would you do this please show me {4a+2u+i=2
{5a+3u+2i=17
{ a-5u =3

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book Other Question

A father is 4 time as old as his son. 5 years ago the sum of their ages was 70 find their present age. does the set of ordered pairs{1,2),(2,3),(3,4),(4,5),(5,6),(6,11) define a function?