To represent the total amount of money, \( y \), that Phil makes each month, you can use the following equation:
\[ y = 1000 + 150x \]
In this equation:
- \( 1000 \) is his base salary per month,
- \( 150 \) is the bonus he earns for each tractor sold,
- \( x \) represents the number of tractors he sells.
So, the total amount Phil makes, \( y \), depends on both his fixed salary and the number of tractors he sells.