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If in (y=260-bx), (y) decreases by (104) from (x=5) to (x=13), what is (b)?

Answer and explanation

Correct answer: 13

The change in x is 13 - 5 = 8. In y = 260 - bx, y decreases by b for every increase of 1 in x. Hence, the total decrease over 8 units is 8b. So, 8b = 104, giving b = 104/8 = 13. Option 12 is close, but it would give a total decrease of 8 × 12 = 96, not 104. Exam tip: For a linear relation, use total change = rate per unit × change in x.

Related tags

Linear EquationsPolynomialsRate Of ChangeLinear DecayAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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