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2010 WAEC Further Mathematics Theory If \(3x^{2} + 2y^{2} + xy + x - 7 = 0\), find \(\frac{\mathrm d...

Further Mathematics
WAEC 2010

If \(3x^{2} + 2y^{2} + xy + x - 7 = 0\), find \(\frac{\mathrm d y}{\mathrm d x}\) at the point (-2, 1).

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Explanation

\(3x^{2} + 2y^{2} + xy + x - 7 = 0\)

We differentiate y implicitly with respect to x.

\(6x + 2(2y)\frac{\mathrm d y}{\mathrm d x} + y + x\frac{\mathrm d y}{\mathrm d x} + 1 = 0\)

\(\frac{\mathrm d y}{\mathrm d x} = \frac{- y - 1 - 6x}{4y + x}\)

= \(\frac{-(6x + y + 1)}{4y + x}\).

At the point (-2, 1),

\(\frac{\mathrm d y}{\mathrm d x} = \frac{-(-12 + 1 + 1)}{4(1) - 2}\)

= \(\frac{-(-10)}{2} = 5\)


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