exam Maths Puzzle Numerical Ability

please help me in this
let f(X) =2x 0

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exam Other Question

Can someone help me on this:

I need to determine whether the following is an expression: (Yes or No)

9 + n = t

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