Questions: Use implicit differentiation to find dy / dx. Then find the slope of the curve at the given point. 9xy - 5x + y = 29 ; (-4,-9/35) The slope of the curve at (-4,-9/35) is

Use implicit differentiation to find dy / dx. Then find the slope of the curve at the given point.
9xy - 5x + y = 29 ; (-4,-9/35)

The slope of the curve at (-4,-9/35) is
Transcript text: Use implicit differentiation to find $d y / d x$. Then find the slope of the curve at the given point. \[ 9 x y-5 x+y=29 ; \quad\left(-4,-\frac{9}{35}\right) \] The slope of the curve at $\left(-4,-\frac{9}{35}\right)$ is $\square$
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Solution

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To find \( \frac{dy}{dx} \) using implicit differentiation, differentiate both sides of the equation \( 9xy - 5x + y = 29 \) with respect to \( x \). Apply the product rule to the term \( 9xy \). After differentiating, solve for \( \frac{dy}{dx} \). Then, substitute the given point \((-4, -\frac{9}{35})\) into the expression for \( \frac{dy}{dx} \) to find the slope of the curve at that point.

Paso 1: Diferenciación implícita

Dada la ecuación \( 9xy - 5x + y = 29 \), aplicamos la diferenciación implícita. Al diferenciar ambos lados con respecto a \( x \), obtenemos: \[ \frac{d}{dx}(9xy) - \frac{d}{dx}(5x) + \frac{d}{dx}(y) = 0 \] Utilizando la regla del producto en \( 9xy \), tenemos: \[ 9\left(x\frac{dy}{dx} + y\right) - 5 + \frac{dy}{dx} = 0 \]

Paso 2: Resolviendo para \( \frac{dy}{dx} \)

Reorganizamos la ecuación para despejar \( \frac{dy}{dx} \): \[ 9x\frac{dy}{dx} + 9y - 5 + \frac{dy}{dx} = 0 \] \[ (9x + 1)\frac{dy}{dx} = 5 - 9y \] Por lo tanto, la derivada implícita es: \[ \frac{dy}{dx} = \frac{5 - 9y}{9x + 1} \]

Paso 3: Evaluando en el punto dado

Sustituyendo el punto \((-4, -\frac{9}{35})\) en la expresión de \( \frac{dy}{dx} \): \[ \frac{dy}{dx} = \frac{5 - 9\left(-\frac{9}{35}\right)}{9(-4) + 1} \] Calculamos el numerador y el denominador: \[ = \frac{5 + \frac{81}{35}}{-36 + 1} = \frac{\frac{175}{35} + \frac{81}{35}}{-35} = \frac{\frac{256}{35}}{-35} = -\frac{256}{1225} \] Al simplificar, obtenemos aproximadamente: \[ \frac{dy}{dx} \approx -0.20898 \]

Respuesta Final

La pendiente de la curva en el punto \(\left(-4, -\frac{9}{35}\right)\) es aproximadamente \(-0.20898\).

\(\boxed{-0.20898}\)

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