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Starting with concrete examples is a good way to get into this problem.
To get a feel for the rate equation and how to solve it, think of a function and evaluate both sides of the equation. If they are the same for a particular choice of $m$ then you have found a solution (well done!). If not, how might you adjust the function to turn it into a solution?
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Age 16 to 18
Challenge Level 
Starting with concrete examples is a good way to get into this problem.
To get a feel for the rate equation and how to solve it, think of a function and evaluate both sides of the equation. If they are the same for a particular choice of $m$ then you have found a solution (well done!). If not, how might you adjust the function to turn it into a solution?
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