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Consider the curve given by the equation 
xy^(2)+5xy=50. It can be shown that

(dy)/(dx)=(-y(y+5))/(x(2y+5))". "
Write the equation of the vertical line that is tangent to the curve.

Consider the curve given by the equation xy2+5xy=50 x y^{2}+5 x y=50 . It can be shown that dydx=y(y+5)x(2y+5) \frac{d y}{d x}=\frac{-y(y+5)}{x(2 y+5)} \text {. } \newlineWrite the equation of the vertical line that is tangent to the curve.

Full solution

Q. Consider the curve given by the equation xy2+5xy=50 x y^{2}+5 x y=50 . It can be shown that dydx=y(y+5)x(2y+5) \frac{d y}{d x}=\frac{-y(y+5)}{x(2 y+5)} \text {. } \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 equal to zero because the slope of a vertical line is undefined, which corresponds to an infinite or undefined derivative.
  2. Solve for y: Set the denominator of the derivative equal to zero and solve for y: \newlinex(2y+5)=0x(2y + 5) = 0\newlineSince xx cannot be zero (as it would make the entire original equation 0=500 = 50, which is false), we must have:\newline2y+5=02y + 5 = 0
  3. Substitute Back and Solve: Solve for yy:2y=52y = -5y=52y = -\frac{5}{2}
  4. Clear Fraction and Simplify: Now we substitute y=52y = -\frac{5}{2} back into the original equation to find the corresponding xx-values: x(52)2+5x(52)=50x\left(-\frac{5}{2}\right)^2 + 5x\left(-\frac{5}{2}\right) = 50
  5. Combine Like Terms: Simplify and solve for xx:x(254)(252)x=50x\left(\frac{25}{4}\right) - \left(\frac{25}{2}\right)x = 50Multiply through by 44 to clear the fraction:25x50x=20025x - 50x = 200
  6. Find xx: Combine like terms: 25x=200-25x = 200
  7. Equation of Vertical Line: Solve for xx:x=8x = -8
  8. Equation of Vertical Line: Solve for xx:x=8x = -8The vertical line that is tangent to the curve at the point where y=52y = -\frac{5}{2} will have an xx-coordinate of 8-8. Therefore, the equation of the vertical line is:x=8x = -8

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