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Consider the curve given by the equation

y^(3)-8y^(2)+16 y-x^(2)+2x=0". "
It can be shown that

(dy)/(dx)=(2(x-1))/((3y-4)(y-4))". "
Find the 
y-coordinate of the point where the line tangent to the curve is the 
y-axis.

y=

Consider the curve given by the equation y38y2+16yx2+2x=0 y^{3}-8 y^{2}+16 y-x^{2}+2 x=0 \text {. } It can be shown that dydx=2(x1)(3y4)(y4) \frac{d y}{d x}=\frac{2(x-1)}{(3 y-4)(y-4)} \text {. } \newlineFind the y y -coordinate of the point where the line tangent to the curve is the y y -axis.\newliney= y=

Full solution

Q. Consider the curve given by the equation y38y2+16yx2+2x=0 y^{3}-8 y^{2}+16 y-x^{2}+2 x=0 \text {. } It can be shown that dydx=2(x1)(3y4)(y4) \frac{d y}{d x}=\frac{2(x-1)}{(3 y-4)(y-4)} \text {. } \newlineFind the y y -coordinate of the point where the line tangent to the curve is the y y -axis.\newliney= y=
  1. Find Tangent Point: To find the yy-coordinate of the point where the line tangent to the curve is the yy-axis, we need to find the point where the derivative (dydx\frac{dy}{dx}) is undefined or zero, since the slope of the tangent line to the yy-axis is vertical (undefined slope).
  2. Derivative Calculation: The derivative of yy with respect to xx is given by dydx=2(x1)(3y4)(y4)\frac{dy}{dx} = \frac{2(x-1)}{(3y-4)(y-4)}. For the tangent to be the y-axis, the numerator of the derivative must be zero, because a zero numerator over a non-zero denominator gives a slope of zero, which corresponds to a horizontal line, not a vertical one. Therefore, we need to find where the denominator is zero, which would make the slope undefined.
  3. Solve for Undefined Slope: Set the denominator of the derivative equal to zero to find the yy-coordinate where the slope is undefined: (3y4)(y4)=0(3y - 4)(y - 4) = 0.
  4. Check Y-Values: Solve the equation (3y4)(y4)=0(3y - 4)(y - 4) = 0 by setting each factor equal to zero: 3y4=03y - 4 = 0 or y4=0y - 4 = 0.
  5. Substitute x=0x=0: Solving 3y4=03y - 4 = 0 gives y=43y = \frac{4}{3}, and solving y4=0y - 4 = 0 gives y=4y = 4.
  6. Factor Out Equation: We need to check which of these yy-values, if any, correspond to the point where the tangent is the yy-axis. We know that at the yy-axis, x=0x = 0. So we substitute x=0x = 0 into the original equation to see if either of these yy-values satisfy the equation.
  7. Final Y-Coordinate: Substitute x=0x = 0 into the original equation y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 0 to get y38y2+16y=0y^3 - 8y^2 + 16y = 0.
  8. Final Y-Coordinate: Substitute x=0x = 0 into the original equation y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 0 to get y38y2+16y=0y^3 - 8y^2 + 16y = 0.Factor out yy from the equation y38y2+16y=0y^3 - 8y^2 + 16y = 0 to get y(y28y+16)=0y(y^2 - 8y + 16) = 0.
  9. Final Y-Coordinate: Substitute x=0x = 0 into the original equation y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 0 to get y38y2+16y=0y^3 - 8y^2 + 16y = 0.Factor out yy from the equation y38y2+16y=0y^3 - 8y^2 + 16y = 0 to get y(y28y+16)=0y(y^2 - 8y + 16) = 0.The factored form of y28y+16y^2 - 8y + 16 is (y4)2(y - 4)^2, so the equation becomes y(y4)2=0y(y - 4)^2 = 0.
  10. Final Y-Coordinate: Substitute x=0x = 0 into the original equation y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 0 to get y38y2+16y=0y^3 - 8y^2 + 16y = 0.Factor out yy from the equation y38y2+16y=0y^3 - 8y^2 + 16y = 0 to get y(y28y+16)=0y(y^2 - 8y + 16) = 0.The factored form of y28y+16y^2 - 8y + 16 is (y4)2(y - 4)^2, so the equation becomes y(y4)2=0y(y - 4)^2 = 0.Set each factor equal to zero: y=0y = 0 or y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 000. Solving y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 000 gives y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 022.
  11. Final Y-Coordinate: Substitute x=0x = 0 into the original equation y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 0 to get y38y2+16y=0y^3 - 8y^2 + 16y = 0.Factor out yy from the equation y38y2+16y=0y^3 - 8y^2 + 16y = 0 to get y(y28y+16)=0y(y^2 - 8y + 16) = 0.The factored form of y28y+16y^2 - 8y + 16 is (y4)2(y - 4)^2, so the equation becomes y(y4)2=0y(y - 4)^2 = 0.Set each factor equal to zero: y=0y = 0 or y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 000. Solving y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 000 gives y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 022.The y-value that satisfies the original equation when x=0x = 0 is y38y2+16yx2+2x=0y^3 - 8y^2 + 16y - x^2 + 2x = 022. This is the y-coordinate of the point where the line tangent to the curve is the y-axis.

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