This week I learned about the “slope man” which is a visual aid to help me figure out if the slope of a line, in graphing, is positive, negative, undefined, or zero. If a slope is negative, the line is decreasing and if a line is increasing, it is positive (shown by the eyes of the man). If a line is undefined, the line is straight and runs vertically up and down (shown by the nose). If a line is zero, the line is straight and runs from left to right horizontally (shown by the mouth).

Here is what the slope man looks like: