exam Maths Puzzle Numerical Ability

In the coordinates (5,-4) which number represents the y value? The answer to this is -4. The next question is "What are the coordinates of the origin?"

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I need the steps and the answer to this :)

Junior tickets to an event are available to teenagers below age eighteen at reduced rates. Write an inequality describing the age requirement for a person of age A who can buy a junior ticket.
whoever is answering this question dont answer it please just tell me if i am doing it right
-2=7(q+2)+3(2q-1)
then
-2=7q+14+6q-3
then
im not sure about the rest though can you please help me