Chapter 8 - Polynomials and Factoring - 8-2 Multiplying and Factoring - Practice and Problem-Solving Exercises - Page 496: 45

$\displaystyle \frac{1}{3}$

Slope=$\displaystyle \frac{\text{change in y}}{\text{change in x}}$ The coordinates of C are $(-7,2)$. The coordinates of D are $(-4,3)$. The slope of $\overline{CD}$ is $m=\displaystyle \frac{3-2}{-4-(-7)}=\frac{1}{3}$