WAEC Further Mathematics 2023 Objective — Question 35

Question 35 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2023 Objective paper, with the correct answer and a full explanation.

Given that y=2x-1 and (delta)x=0.1, find (delta)y.

A. 0.20Correct
B. 0.15
C. 0.10
D. 0.05

Explanation

dy/dx=2. Since dy/dx is approximately (delta)y/(delta)x: 2=(delta)y/0.1 => (delta)y=0.1(2)=0.2.

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