Some data were collected on the weight of a male white laboratory rat for the first 25 weeks after its birth. A scatterplot of y - weight (in grams) and 1 = time since birth (in weeks) shows a fairly strong, positive linear relationship. The regression equation y = 100 + 40r models the data fairly well. 1. Interpret the slope of the regression line. 2. Does the value of the y intercept have meaning in this context? If so, interpret the y intercept. If not, explain why