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When will the two models (A(t)=64+9t) and (B(t)=184-6t) be equal?

Answer and explanation

Correct answer: \(t=8\)

For the models to be equal, set \(64+9t=184-6t\). Moving \(6t\) to the left gives \(15t=120\), so \(t=8\). Although \(t=7\) is a close distractor, the two model values are not equal at that time. Exam tip: when one linear model increases and the other decreases, equate their expressions and solve for \(t\).

Related tags

Linear EquationsLinear ModelsGrowth And DecayPolynomialsAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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