exam Maths Puzzle Numerical Ability

A different insect population is modeled by  where  represents the number of insects in the population at time , and  represents time measured in da

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Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if How do I rewrite the equation 4x - 10y = 11?