Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

The differentiable functions 
x and 
y are related by the following equation:

(1)/(y)=8-x
Also, 
(dy)/(dt)=-0.5.
Find 
(dx)/(dt) when 
y=0.2.

The differentiable functions x x and y y are related by the following equation:\newline1y=8x \frac{1}{y}=8-x \newlineAlso, dydt=0.5 \frac{d y}{d t}=-0.5 .\newlineFind dxdt \frac{d x}{d t} when y=0.2 y=0.2 .

Full solution

Q. The differentiable functions x x and y y are related by the following equation:\newline1y=8x \frac{1}{y}=8-x \newlineAlso, dydt=0.5 \frac{d y}{d t}=-0.5 .\newlineFind dxdt \frac{d x}{d t} when y=0.2 y=0.2 .
  1. Differentiate with respect to tt: First, we need to differentiate the given equation with respect to tt. The equation is 1y=8x\frac{1}{y} = 8 - x. We will use implicit differentiation.
  2. Apply chain rule: Differentiating both sides of the equation with respect to tt, we get:\newline(ddt)(1y)=(ddt)(8x)(\frac{d}{dt})(\frac{1}{y}) = (\frac{d}{dt})(8 - x)\newlineSince 88 is a constant, its derivative is 00, and the derivative of x-x with respect to tt is (dxdt)-(\frac{dx}{dt}).
  3. Substitute derivatives: The left side of the equation involves the derivative of a reciprocal function. Using the chain rule, the derivative of 1y\frac{1}{y} with respect to tt is: ddt(1y)=dydt/y2\frac{d}{dt}(\frac{1}{y}) = -\frac{dy}{dt}/y^{2}
  4. Given values substitution: Substituting the derivatives into the differentiated equation, we get:\newlinedydt/y2=dxdt-\frac{dy}{dt}/y^2 = -\frac{dx}{dt}
  5. Simplify to solve: We are given that dydt=0.5\frac{dy}{dt} = -0.5 and we need to find dxdt\frac{dx}{dt} when y=0.2y = 0.2. Let's substitute these values into the equation:\newline(0.5)/(0.22)=(dxdt)-\left(-0.5\right)/\left(0.2^2\right) = -\left(\frac{dx}{dt}\right)
  6. Calculate final value: Simplify the equation to solve for (dxdt):(\frac{dx}{dt}):(dxdt)=(0.50.22)(\frac{dx}{dt}) = -(-\frac{0.5}{0.2^2})(dxdt)=0.50.04(\frac{dx}{dt}) = \frac{0.5}{0.04}
  7. Calculate final value: Simplify the equation to solve for (dxdt):(\frac{dx}{dt}):(dxdt)=(0.5)/(0.22)(\frac{dx}{dt}) = -(-0.5)/(0.2^2)(dxdt)=0.50.04(\frac{dx}{dt}) = \frac{0.5}{0.04}Calculate the value of (dxdt):(\frac{dx}{dt}):(dxdt)=0.50.04(\frac{dx}{dt}) = \frac{0.5}{0.04}(dxdt)=12.5(\frac{dx}{dt}) = 12.5

More problems from Simplify expressions using trigonometric identities