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Section 2.1

Linear Functions and Models

• Recognize exact and approximate models for data

• From a graph of a linear function identify
  
• the slope
• y-intercept
• x-intercept
• zero
• From a graph of a linear function write a formula

• Using a symbolic representation of a linear function, identify the slope and y-intercept

• Write a formula for a linear function given the slope and a point on the graph

• Read and interpret a piecewise-defined function displayed graphically

• Given a piecewise-defined function symbolically, evaluate the function for different values in its domain

• Graph a piecewise-defined function

• Given the graph of a piecewise-defined function, identify if it is continuous on its domain

• Solve applications involving linear functions

• Use linear regression to model data
  

• Find a function that models data using linear regression