book Maths Puzzle Numerical Ability

given that angle ABD=2y and angle DBC=6y-2, find angle DBC

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Tutor please help me too answer this guestion.
I need to determine whether this relation is a function...
[(5,-2),(3,2),(4,-1),(-2,2)]

P.s What is a function? there were 429 people nat a play. admission was $1 for adults and $.75 for children. the receits were $372.50. How many adults and how many children attended the play?