For the graph y = 12 find the slope of a line that is perpendicular to it and the slope of a line parallel to it. Explain your answer with two or more sentences.
The line y = 12 is a horizontal line with a slope of 0. Therefore a line parallel to line y = 12 will have a slope of 0. A line perpendicular to line y = 12 is a vertical line, the slope of a vertical line is undefined.