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If in (y=220+ax), (y) increases by (144) from (x=9) to (x=17), what is (a)?

Answer and explanation

Correct answer: 18

The change in x is 17 - 9 = 8. In the linear expression y = 220 + ax, the change in y is aΔx, so 8a = 144. Hence, a = 144/8 = 18, making option C correct. If a were 16, the increase in y would be only 128. Exam tip: the constant term 220 does not affect the change in y.

Related tags

Linear EquationsRate Of ChangePolynomialsCoefficientAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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