1. heart weight = -0.354 + 4.034 * body weight
  2. Expected heart weight with zero body weight is -0.354 which is not meaningful in our case but used to compute the regression line.
  3. For each additional kg of body weight, heart weight is expected to increase on average by 4.034g.
  4. Body weight explains 64.66% of the variability in heart weights in cats.
  5. 0.8041144