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Write an equation that describes the following relationship: 
y varies inversely as the fourth power of 
x and when 
x=1,y=3.

Write an equation that describes the following relationship: y y varies inversely as the fourth power of x x and when x=1,y=3 x=1, y=3 .

Full solution

Q. Write an equation that describes the following relationship: y y varies inversely as the fourth power of x x and when x=1,y=3 x=1, y=3 .
  1. Determine Form of Equation: Determine the form of the inverse variation equation.\newlineIn an inverse variation where yy varies inversely as the fourth power of xx, the equation takes the form: y=kx4y = \frac{k}{x^4}, where kk is the constant of variation.
  2. Find Constant of Variation: Use the given values to find the constant of variation kk. We are given that when x=1x=1, y=3y=3. Substitute these values into the equation to find kk: 3=k143 = \frac{k}{1^4}.
  3. Solve for Constant kk: Solve for the constant of variation kk.\newlineSince 14=11^4 = 1, the equation simplifies to 3=k3 = k. Therefore, k=3k = 3.
  4. Write Final Equation: Write the final inverse variation equation using the value of kk. Substitute k=3k = 3 into the inverse variation equation: y=3x4y = \frac{3}{x^4}.

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