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If in (y=70+ax), (y) increases by (35) from (x=4) to (x=9), what is (a)?

Answer and explanation

Correct answer: 7

The change in x is 9−4=5. In the linear expression y=70+ax, the change in y is a×5. Hence, 5a=35, so a=7. Option 5 represents the change in x, not the value of a. Exam tip: In y=mx+c, identify m as the rate of change.

Related tags

Linear EquationsRate Of ChangeCoefficientAlgebraPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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