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Consider the curve given by the equation 
xy^(2)-x^(3)y=8. It can be shown that 
(dy)/(dx)=(3x^(2)y-y^(2))/(2xy-x^(3)).
Write the equation of the vertical line that is tangent to the curve.

Consider the curve given by the equation xy2x3y=8 x y^{2}-x^{3} y=8 . It can be shown that dydx=3x2yy22xyx3 \frac{d y}{d x}=\frac{3 x^{2} y-y^{2}}{2 x y-x^{3}} .\newlineWrite the equation of the vertical line that is tangent to the curve.

Full solution

Q. Consider the curve given by the equation xy2x3y=8 x y^{2}-x^{3} y=8 . It can be shown that dydx=3x2yy22xyx3 \frac{d y}{d x}=\frac{3 x^{2} y-y^{2}}{2 x y-x^{3}} .\newlineWrite the equation of the vertical line that is tangent to the curve.
  1. Set Denominator Equal to Zero: To find the vertical tangent, we need to set the denominator of the derivative dydx\frac{dy}{dx} equal to zero, because the slope of a vertical line is undefined, and this occurs when the denominator of the slope expression is zero.
  2. Factor and Solve for xx: The denominator of the derivative is 2xyx32xy - x^3. Set this equal to zero to find the xx-values where the tangent line could be vertical.\newline2xyx3=02xy - x^3 = 0
  3. Check x=0x = 0: Factor out xx from the equation.x(2yx2)=0x(2y - x^2) = 0
  4. Solve for yy: Setting each factor equal to zero gives us the xx-values where the tangent could be vertical.x=0x = 0 or 2yx2=02y - x^2 = 0
  5. Substitute yy into Original Equation: If x=0x = 0, then the equation 2yx2=02y - x^2 = 0 is automatically satisfied, so we don't get additional information from the second factor. We need to check if x=0x = 0 is indeed a point on the curve.
  6. Simplify and Combine Terms: Substitute x=0x = 0 into the original equation xy2x3y=8xy^2 - x^3y = 8 to see if it yields a valid point on the curve.0y203y=80\cdot y^2 - 0^3\cdot y = 80=80 = 8This is not true, so x=0x = 0 is not a point on the curve, and therefore cannot be where a vertical tangent occurs.
  7. Solve for x5x^5: Now, let's solve the second factor 2yx2=02y - x^2 = 0 for yy to find the corresponding yy-values for the vertical tangent.\newline2y=x22y = x^2\newliney=12x2y = \frac{1}{2}x^2
  8. No Real Solution: Substitute y=12x2y = \frac{1}{2}x^2 back into the original equation to find the xx-values that satisfy both the original equation and the condition for a vertical tangent.\newlinex(12x2)2x3(12x2)=8x\left(\frac{1}{2}x^2\right)^2 - x^3\left(\frac{1}{2}x^2\right) = 8
  9. No Real Solution: Substitute y=12x2y = \frac{1}{2}x^2 back into the original equation to find the xx-values that satisfy both the original equation and the condition for a vertical tangent.\newlinex(12x2)2x3(12x2)=8x*\left(\frac{1}{2}x^2\right)^2 - x^3*\left(\frac{1}{2}x^2\right) = 8 Simplify the equation.\newlinex(14x4)(12x5)=8x*\left(\frac{1}{4}x^4\right) - \left(\frac{1}{2}x^5\right) = 8\newline(14x5)(12x5)=8\left(\frac{1}{4}x^5\right) - \left(\frac{1}{2}x^5\right) = 8
  10. No Real Solution: Substitute y=12x2y = \frac{1}{2}x^2 back into the original equation to find the xx-values that satisfy both the original equation and the condition for a vertical tangent.\newlinex(12x2)2x3(12x2)=8x*\left(\frac{1}{2}x^2\right)^2 - x^3*\left(\frac{1}{2}x^2\right) = 8 Simplify the equation.\newlinex(14x4)(12x5)=8x*\left(\frac{1}{4}x^4\right) - \left(\frac{1}{2}x^5\right) = 8\newline(14x5)(12x5)=8\left(\frac{1}{4}x^5\right) - \left(\frac{1}{2}x^5\right) = 8 Combine like terms.\newline(14x5)=8-\left(\frac{1}{4}x^5\right) = 8
  11. No Real Solution: Substitute y=12x2y = \frac{1}{2}x^2 back into the original equation to find the xx-values that satisfy both the original equation and the condition for a vertical tangent.\newlinex(12x2)2x3(12x2)=8x*\left(\frac{1}{2}x^2\right)^2 - x^3*\left(\frac{1}{2}x^2\right) = 8 Simplify the equation.\newlinex(14x4)(12x5)=8x*\left(\frac{1}{4}x^4\right) - \left(\frac{1}{2}x^5\right) = 8\newline(14x5)(12x5)=8\left(\frac{1}{4}x^5\right) - \left(\frac{1}{2}x^5\right) = 8 Combine like terms.\newline(14x5)=8-\left(\frac{1}{4}x^5\right) = 8 Multiply both sides by 4-4 to solve for x5x^5.\newlinex5=32x^5 = -32
  12. No Real Solution: Substitute y=12x2y = \frac{1}{2}x^2 back into the original equation to find the xx-values that satisfy both the original equation and the condition for a vertical tangent.x(12x2)2x3(12x2)=8x*\left(\frac{1}{2}x^2\right)^2 - x^3*\left(\frac{1}{2}x^2\right) = 8Simplify the equation.x(14x4)(12x5)=8x*\left(\frac{1}{4}x^4\right) - \left(\frac{1}{2}x^5\right) = 8(14x5)(12x5)=8\left(\frac{1}{4}x^5\right) - \left(\frac{1}{2}x^5\right) = 8Combine like terms.(14x5)=8-\left(\frac{1}{4}x^5\right) = 8Multiply both sides by 4-4 to solve for x5x^5.x5=32x^5 = -32Since x5=32x^5 = -32 has no real solution (as the fifth root of a negative number is not real), there are no xx-values that satisfy the condition for a vertical tangent on the curve xy2x3y=8xy^2 - x^3y = 8. Therefore, there is no vertical line that is tangent to the curve.

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