Two straight lines are obtained when we plot a pair of linear equations on the graph paper which gives rise to three conditions. Three possibilities may occur on plotting the equations ...

A linear equation is drawn as a straight line on a set of axes. To draw the graph we need coordinates. We generate these coordinates by substituting values into the linear equation. STEP 1 - Draw ...

This is an interesting class of functions, but not nearly interesting enough for calculus purposes. While I do spend lots of time pushing the idea of linear approximations on my students ...