Given that \(y = 4 - 9x\) and \(\Delta x = 0.1\), calculate \(\Delta y\).
FURTHER MATHEMATICS
WAEC 2015
Given that \(y = 4 - 9x\) and \(\Delta x = 0.1\), calculate \(\Delta y\).
- A. 9.0
- B. 0.9
- C. -0.3
- D. -0.9
Correct Answer: D. -0.9
Explanation
\(y = 4 - 9x\)
\(\frac{\mathrm d y}{\mathrm d x} = \frac{\Delta y}{\Delta x} = -9\)
\(\frac{\Delta y}{0.1} = -9 \implies \Delta y = -9 \times 0.1 = -0.9\)
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *