Answer:
![(35-21)/(8-4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/hqmhgjg66d93a302jbyedc5zvcei87uctj.png)
Explanation:
The slope of a line equals to the difference between points' y-coordinates divided by the difference between their x-coordinates.
That is, if
and
are the point of a line,
Then the slope of the line is,
![m=(y_2-y_1)/(x_2-x_1)](https://img.qammunity.org/2020/formulas/mathematics/high-school/pj0y5tg37a7a9ase0auiwe687ez8iaw2vl.png)
By the given diagram,
,
,
and
![y_2=35](https://img.qammunity.org/2020/formulas/mathematics/middle-school/rt3r4fnbhge2emdoz1nfsflq7a2a3ksb3t.png)
Thus, the slope of the given line
=
![(35-21)/(8-4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/hqmhgjg66d93a302jbyedc5zvcei87uctj.png)
⇒ Fourth option is correct.