Final answer:
To solve for the constant of variation, k, in an inverse variation problem, substitute the given values for x and y into the equation y = k/x and solve for k.
Step-by-step explanation:
To solve for the constant of variation, k, in an inverse variation problem, we can use the equation y = k/x. Given that x = 5 and y = 25, we can substitute these values into the equation to solve for k. So, 25 = k/5. To isolate k, we can multiply both sides of the equation by 5, which gives us 125 = k. Therefore, the constant of variation is k = 125.