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The problem asks for an equation representing the total amount Macario earns in a day, based on his daily wage and commission. Let's break it down and write the equation in slope-intercept form.

### Given:
- Macario earns a **fixed amount of $72** each day.
- He also earns **12% commission** on the items he sells. Let **x** represent the total cost of the items sold in a day.

### Step-by-Step Solution:
1. **Fixed earnings:** Each day, regardless of sales, Macario earns $72. This is a constant amount.
   
2. **Commission:** He earns 12% of the total sales. If **x** is the total cost of items sold, then his commission is:
   \[
   0.12 \times x
   \]

3. **Total earnings:** The total amount **y** he earns in a day is the sum of his fixed earnings and his commission:
   \[
   y = 72 + 0.12x
   \]

### Final Answer:
The equation in slope-intercept form is:
\[
y = 0.12x + 72
\]
This equation represents Macario's total daily earnings, where **x** is the total value of the items he sells, and **y** is his total earnings.

Would you like more details or have any questions about this?

Here are 5 related questions to expand on this:
1. How would the equation change if the commission was 15% instead of 12%?
2. What is Macario’s total earnings if he sells $500 worth of items in a day?
3. How can we interpret the slope of the equation in this context?
4. What happens to his earnings if no items are sold in a day?
5. How would you graph this equation, and what would the y-intercept represent?

**Tip:** Slope-intercept form is useful for modeling situations with a fixed starting amount and a variable rate. The slope represents the rate of change, while the intercept is the starting value.

Macario works at a clothing store. He is paid $72 each day that he works plus 12% commission on the items he sells. Write an equation in slope-intercept form to represent the total amount Macario earns in a day based on the total cost of the items he sells that day x.

Learn how to model Macario's daily earnings using slope-intercept form. This problem covers essential algebra concepts including linear equations, percentages, and fixed commission rates. Explore the equation y = 0.12x + 72, where x is the sales amount and y is the total earnings. Suitable for Grades 7-9.

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