M**GSE8.F.3**:Interpret the equation y = mx + b as defining a linear function, whose graph is a straight line; give examples of functions that are not linear.
**(8th Grade) MGSE8.F.4 **:Construct a function to model a linear relationship between two quantities. Determine the rate of change and initial value of the function from a description of a relationship or from two (x,y) values, including reading these from a table or from a graph. Interpret the rate of change and initial value of a linear function in terms of the situation it models, and

**MGSE9-12.G.GPE.5 **: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 that passes through a given point).