Construct linear functions given a graph, a description of a relationship, or two input-output pairs (include reading these from a table).
Create equations in two or more variables to represent relationships between quantities; graph equations on coordinate axes with labels and scales.
Interpret the slope (rate of change) and the intercept (constant term) of a linear model in the context of the data.
Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line passing through a given point.)
Understand that the graph of an equation in two variables is the set of all its solutions plotted in the coordinate plane, often forming a curve (which could be a line).
Graph functions expressed symbolically and show key features of the graph, by hand in simple cases and using technology for more complicated cases.*