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If in (y=360-bx), (y) decreases by (136) from (x=7) to (x=15), what is (b)?

Answer and explanation

Correct answer: 17

The change in x is 15 − 7 = 8. In y = 360 − bx, y decreases by b units for every 1-unit increase in x. Hence, the total decrease is 8b = 136. Therefore, b = 136/8 = 17. If b were 16, the decrease would be 8 × 16 = 128, not 136. Exam tip: For a linear expression, multiply the change in x by its coefficient to find the total change in y.

Related tags

Linear DecayLinear EquationsRate Of ChangePolynomialsAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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