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Which of the following relations shows that y decreases by a constant amount whenever x increases by 1 unit?

Answer and explanation

Correct answer: \(y=18-3x\)

In \(y=18-3x\), the coefficient of x is the constant \(-3\), so y falls at the same rate as x increases. A relation containing \(x^2\) is not linear. Exam tip: for linear decay, look for x to power 1 with a negative coefficient.

Related tags

Linear DecayLinear PolynomialConstant RateCoefficientAlgebraClass 9Linear Growth And DecayIntroduction To Polynomials

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