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If a quantity starts at (70) and decreases by (5) each step, which rule represents it?

Answer and explanation

Correct answer: \(y=70-5x\)

The starting quantity is 70, so when \(x=0\), the value of \(y\) must be 70. Since it decreases by 5 at each step, the coefficient of \(x\) is \(-5\). Therefore, the rule is \(y=70-5x\). In \(y=70+5x\) and \(y=5x+70\), the quantity increases rather than decreases. Exam tip: in a linear rule, the constant term is the initial value, and a decrease has a negative slope.

Related tags

Linear DecayLinear EquationsPolynomial IntroductionMathematical ModellingGrade 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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