To represent Lindsay's practice time with an equation, let's define:
- \( x \): the number of weekdays she practiced (Monday through Friday).
Lindsay practices 30 minutes on most weekdays. If she practices \( x \) weekdays, her total practice time for those days is \( 30x \).
She also practices for 50 minutes on Saturday.
Putting this information together, we can represent her total practice time as:
\[ 30x + 50 = 140 \]
Now, rearranging this in the form \( px + q = r \):
\[ 30x + 50 = 140 \]
So, in the required format:
- \( p = 30 \)
- \( q = 50 \)
- \( r = 140 \)
The complete equation is:
\[ 30x + 50 = 140 \]