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Which model shows that y decreases by a fixed positive amount r for every one-unit increase in x, and y equals p when x=0?

Answer and explanation

Correct answer: \(y=p-rx,\; p,r>0\)

In \(y=p-rx\), increasing x by 1 changes y by \(-r\), so the decrease is constant; putting \(x=0\) gives y=p. \(p+rx\) represents growth instead. Exam tip: identify decay by a negative slope.

Related tags

Linear Growth And DecayLinear EquationsSlopePolynomialsGrade 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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