Given the following information, what is the least squares estimate of the y-intercept? 
Definitions:
Problem-Solution Sales Presentation
A sales strategy that identifies a problem faced by a potential customer and proposes a solution using the seller's product or service.
Need-Satisfaction Method
A sales approach that focuses on identifying and fulfilling the specific needs or desires of a customer through the product or service offered.
Formula Sales Method
A structured approach to selling that follows a specific set of steps or formulas to achieve sales success.
Problem-Solution Presentation
A sales technique that identifies a specific problem faced by the potential customer and then presents the product or service as the solution.
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