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If the number of objects starts from (2) and increases by (3) each step, what is the correct rule after (x) steps?

Answer and explanation

Correct answer: \(y=2+3x\)

At the start, that is, when \(x=0\), the number is \(2\). Since \(3\) is added at every step, the total increase after \(x\) steps is \(3x\). Therefore, the rule is \(y=2+3x\). The expression \(y=2-3x\) represents decay, while \(y=3x-2\) has an initial value of \(-2\). Exam tip: in a linear rule, the constant term is the starting value and the coefficient of \(x\) is the change per step.

Related tags

Linear GrowthLinear EquationPolynomialsAlgebraic ExpressionsMathematical ModellingLinear Growth And DecayIntroduction To PolynomialsMathematics

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