To solve this problem, let's define the variable \( x \) as the number of children Anthony watches.
According to the problem:
- He earns $8.00 per hour for his job.
- He earns an additional $1.50 for each child he watches.
Thus, the total earnings per hour can be expressed as:
\[ \text{Total hourly rate} = \text{Base rate} + \text{Bonus per child} \cdot \text{Number of children} \]
In equation form, this can be written as:
\[ 8.00 + 1.50x = 12.50 \]
This is now in the form \( px + q = r \), where:
- \( p = 1.50 \)
- \( x = \) number of children (our variable)
- \( q = 8.00 \)
- \( r = 12.50 \)
Thus, the equation representing this problem is:
\[ 1.50x + 8.00 = 12.50 \]