Lamb's-quarter weed is a common weed that inhibits the growth of corn. In a study, corn was planted at the same rate across 16 plots of land, and then the plots were weeded at different rates to allow a specific number of weeds to grow. No weeds other than lamb's-quarter were allowed to grow at all. The study aimed to see how much corn yield was affected by the presence of increased number of lamb's- quarter weeds per meter. When the study is finished, the data has a least squares regression line of y=1.341x + 167.8. interpret the slope in this equation.