Solve the system using the elimination method. If the system has coincident dependence, state the solution in set notation. 
Definitions:
Regression Line
A line that best represents the connection between data points on a scatter plot.
Slope
Mathematically, the rate of change or gradient of a line, representing the ratio of the vertical change to the horizontal change between two points on the line.
Regression Analysis
A statistical method for examining the relationship between a dependent variable and one or more independent variables.
Statistical Models
Representations of complex systems through mathematical formulas and algorithms based on statistical principles.
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