A high-tech firm decides to develop a model to estimate the time required to develop a new e-commerce website. The candidate list of independent variables is as follows.

X₁ = number of requests for customer information in the program

X₂ = average number of lines of code associated with each request

X₃ = number of modules or subprograms

Table 1 summarizes the data collected on 10 similar development efforts. The time required in person months, denoted by y, is the dependent variable (the duration is given by the number of person-months divided by the number of programmers assigned to the project).

As a consultant, use your expertise to develop the equation that best fits their needs.