(i) State the general equation of a horizontal line and of a vertical line in the Cartesian plane.
(i) State the general equation of a horizontal line (i.e., y=c, where c is a constant) and of a vertical line (i.e., x=k, where k is a constant) in the Cartesian plane.
(ii) Explain why every horizontal line has slope equal to 0, while the slope of a vertical line cannot be assigned a finite numerical value.
(iii) Sketch on the same set of axes the graphs of the lines y=3 and x=−2. Clearly label each line on your diagram.