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If in (y=150+ax), (y) increases by (104) from (x=7) to (x=15), what is (a)?

Answer and explanation

Correct answer: 13

The change in x is 15−7=8. In the linear expression y=150+ax, the change in y equals a times the change in x. Thus, 8a=104, so a=104/8=13. If 12 were chosen, the increase in y would be 8×12=96, not 104. Exam tip: the constant term 150 does not affect the change; only the ax term determines it.

Related tags

Linear EquationsRate Of ChangePolynomialsCoefficientAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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