1. **State the problem:** We want to find the equation that represents the amount of money $y$ he has left after some transactions involving $x$. 2. **Analyze the options:** The options are: - $y = 120x + 10$ - $y = 120 + 10x$ - $y = 120 - 10x$ - $y = 120x - 10$ 3. **Interpret the variables:** Usually, $x$ represents the number of items or times an action occurs, and $y$ is the remaining money. 4. **Formulate the correct equation:** If he starts with 120 and spends 10 for each $x$, the equation is: $$y = 120 - 10x$$ This means he starts with 120 and subtracts 10 times $x$. 5. **Calculate how much money he has when $x=0$:** $$y = 120 - 10 \times 0 = 120$$ So initially, he has 120. 6. **Final answers:** - The correct equation is $y = 120 - 10x$. - The amount of money he has initially is 120.