On graph paper, plot the points $A(−3, −1)$ and $B(6, 11)$.

1. Find the midpoint of $\overline {AB}$. 

   Hint (a):

    $\text{midpoint}=\left(\frac{x_1+x_2}{2}\frac{y_1+y_2}{2}\right)$

2. Find the equation of the line that passes through points $A$ and $B$.

   Hint (c):

   What is the $y$-intercept? What is the slope?

3. Find the distance between points $A$ and $B$.

   Hint (d):

   Use a slope triangle drawn between $A$ and $B$, and the Pythagorean Theorem to calculate the distance.