PHP-Scatterplot : Basic Usage Layer # x y 0 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 8 6 7 4 7 8 7 8 9 11 9 10 9 10 11 1 Regression Line Formula y = 0.51818181818182 x + 1.8909090909091