exam Maths Puzzle Numerical Ability

Can you please help me to write an equation for a direct variation with a graph that passes through these points: (9, -1)

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exam Other Question

How would you write this rational expression in lowest terms?

g^2-5g-14/g^2+g-2
Factor: 25v^2 + 30vw + 9w^2

please explain thoroughly as I would like to know how to solve on my own. thanks