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Which of the following relations shows that y decreases by 8 units for every 1-unit increase in x, with a linear change?

Answer and explanation

Correct answer: \(y=120-8x\)

In \(y=120-8x\), the coefficient of x is \(-8\), so y falls by 8 when x rises by 1. \(120+8x\) represents growth. Exam tip: in \(y=a+bx\), a negative b indicates linear decay.

Related tags

Linear DecayLinear GrowthPolynomialsLinear RelationCoefficientClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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