Final answer:
Given the inverse proportionality condition when x=4, y=7.5, we find the constant factor, k=120. Then, substituting x=5 into the equation, we determine that y equals 4.8.
Step-by-step explanation:
The concept here is inverse proportionality, meaning the relationship between x and y is such that they multiply to give a constant value.
This is represented in the equation y = k/(x^2), where k is the constant. As we know that when x=4, y=7.5, we get k = y * x^2 = 7.5 * 4^2 = 120. When x = 5, we substitute these values into the equation to get y = 120/(5^2) = 120/25 = 4.8.
Learn more about Inverse Proportionality