Linear regression gradient step

Perform one full-batch gradient-descent update step for simple linear regression y = w*x + b under mean-squared error. Given parallel lists xs and ys (n>=1 points), current weight w, bias b, and learning rate lr, compute predictions p_i = w*x_i + b, the error e_i = p_i - y_i, the gradients dw = (2/n)*sum(e_i*x_i) and db = (2/n)*sum(e_i), then return the updated parameters [w - lr*dw, b - lr*db]. Round each returned parameter to 6 decimal places.