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Which rule represents linear growth?

Answer and explanation

Correct answer: \(y=12+5x\)

A linear rule has the form \(y=a+bx\). When \(b\) is positive, \(y\) increases at a constant rate as \(x\) increases. In \(y=12+5x\), the coefficient of \(x\) is \(5\), so it represents linear growth. \(y=30-2x\) is linear but represents decay because its coefficient is negative, while \(y=x^2+1\) is not linear. Exam tip: check the sign of the coefficient of \(x\) to identify linear growth.

Related tags

Linear GrowthLinear EquationsPositive SlopePolynomialsMathematics Class 9Linear Growth And DecayIntroduction To PolynomialsMathematics

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