basically look at the points where the line meets the graph. two points would be 0,20 and 50,40. then count the amount that it changes vertically and then horizontally. +20vertical +50 horizonal giving the slope 20/50. this can then be simplified to 2/5 or the equivalent number .4
12 black and white, 18 color in one row 6 black and white, 9 color in two rows 4 black and white, 6 color in three rows 2 black and white, 3 color in six rows
