Final answer:
To find the value of c that makes f(x, y) a probability density function, we need to know the specific form of the function and use calculus to find the area under the curve.
Step-by-step explanation:
In order for a function f(x, y) to be a probability density function, it must satisfy certain conditions. One of the conditions is that the total probability under the curve is equal to 1. The area under the curve between two points represents the probability that the variable falls between those two values.
To find the value of c that makes f(x, y) a probability density function, we need to know the specific form of the function. Without that information, it is not possible to determine the value of c. However, we can use calculus to find the area under the curve for many probability density functions and determine the value of c based on that.