Given:
A line passes through the points (9,9) and
.
The slope of the line is
.
To find:
The value of
.
Solution:
Slope formula:

The line passes through the points (9,9) and
. So, the slope of the line is:


It is given that the slope of the line is
.





Divide both sides by 5.


Therefore, the value of
is
.