A series of Desmos activities focused on exploring the key understandings that(1) Rates of change express themselves as slope of a line, and as a coefficient of x in a linear equation and (2) Y-intercepts express themselves as constants in linear equations.

Note: This bundle presumes that students have some experience with the coordinate plane, and with plotting points on the coordinate plane. They have not mastered the relationship between any of the forms of a linear equation and the associated graph. They may not know the terms slope or y-intercept. They have worked with algebraic variables. They know quite a bit about proportionality in general and rates in particular.