To determine the monthly costs of the two plans in terms of \( x \), where \( x \) represents the number of movies watched per month, we can write the equations for Plan A and Plan B as follows:
Plan A:
- Monthly cost = Monthly subscription + Cost per movie watched
- Monthly cost \( A \) can be expressed as: \[ A = 16 + 1.50x \]
Plan B:
- Monthly cost = Monthly subscription + Cost per movie watched
- Monthly cost \( B \) can be expressed as: \[ B = 20 + 0.50x \]
Now, we want to find the number of monthly movies watched \( x \) that makes the costs of the two plans equal. To do this, we can set the equations equal to each other: \[ 16 + 1.50x = 20 + 0.50x \]
Next, we can solve for \( x \):
-
Subtract \( 0.50x \) from both sides: \[ 16 + 1.50x - 0.50x = 20 \] which simplifies to: \[ 16 + 1.00x = 20 \]
-
Subtract 16 from both sides: \[ 1.00x = 20 - 16 \] which simplifies to: \[ 1.00x = 4 \]
-
Divide both sides by 1: \[ x = 4 \]
Thus, the number of monthly movies watched \( x \) that would make the two plans have an equal monthly cost is: \[ \boxed{4} \]