Final answer:
The student's question is regarding a system of linear equations, but the question is incomplete, making it impossible to solve without the full set of equations. The context also suggests involvement of linear regression analysis.
Step-by-step explanation:
The student is dealing with a system of linear equations. To find the solution, we need to either use substitution or elimination method to solve for x and y. However, the question appears to be incomplete, as it references various equations and values that are not fully provided. Without the complete set of equations, it is not possible to determine the exact solution for x and y. In the context of data analysis, the mention of line of best fit and calculations for y suggest that the student may also be working with linear regression analysis.