book Maths Puzzle Numerical Ability

what is the true difinition of function?
can u solve this equation{3x=2y+2}pls splve this 4 just a minute and pls explain
x-4y=3

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book Other Question

Intersections and Unions
If p={-3,-2,0,1,5}
T={0,1,6,9}
and S={-3,1,6}
find T U S
How do i do This?
Thank you
complete the next two terms for the following sequence:-
5/7, 3/4, 7/9, 5/4, , ,