Find the slope - Given a list of four integers [a,b,c,d] representing two points (a, b) and (c, d), calculate the slope of the line joining these two points. Instead of a list, you can assign values to four variables. For an undefined slope (division by 0), have the sprite say ‘These points lie on a vertical line.’ If the slope of the line is zero, have the sprite say, ‘These points lie on a horizontal line.’ In all other cases, have the sprite say, ‘The slope of the line joining these two points is [slope].’ Learn more about slope here: http://mathforum.org/cgraph/cslope/calculate.html Learn about the slope of horizontal and vertical lines here: http://mathforum.org/cgraph/cslope/horizontal.html Test cases: [1, 2, 3, 4] --> (1, 2) and (3, 4) = 1 [1, 2, 13, 8] --> (1,2) and (13, 8) = 0.5 [2, 3, 1, 5] --> (2, 3) and (1, 5) = -2 [2, 3, 2, 6] --> (2, 3) and (2, 6) = undefined, vertical [1, 3, 6, 3] --> (1, 3) and (6, 3) = 0, horizontal Based on http://www.codewars.com/kata/find-the-slope
