exam Maths Puzzle Numerical Ability

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

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exam Other Question
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?" This is another question that has me confused. Your explanation or steps would be helpful to solve my other equations. thanks

(x^2y^-1m^-3)^3
____________
2p^-4

thank you