exam Maths Puzzle Numerical Ability

I have no clue if finding the rate of change goes in this section:

The question says,

find the rate of change for each situation.

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exam Other Question

what is a real-life situation that follwos a linear equation, withthe independent variables being years. What would the slope say about the future years. If you have l(1) with equation x-3y=6 L2 with equation 3x+y=3