Practice finding the slope of a line given two points. 9 Mystery Pictures with 27 Color By Code Math Worksheets. Each worksheet includes 10 unique problems. All pictures have a colored answer key. Directions: Find the slope of a line given two points. Look at the color next to it, and then color in ALL of the squares that have that answer. Examples: (-2,3) & (-9, -1) m = ? Answer: m = 4/7 (1,4) & (-7, -4) m = ? Answer: m = 1 Please CLICK HERE to view other Math Mystery Picture products