Answer:
Sure, I can help you with that. To make a graph, you need to follow these steps:
- Select a graph or diagram template that suits your data and purpose. In this case, you can use a line graph or a scatter plot to show the relationship between the number of shirts and the total cost.
- Add your data or information to the template. You can type in the numbers manually or upload an existing spreadsheet file.
- Add icons or illustrations from the library if you want to make your graph more appealing and informative.
- Customize your graph by changing the colors, fonts, labels, axes, legends, titles, and other elements. You can also apply different styles and themes to your graph.
- Download, share or print your graph as you wish. You can also embed it in other documents or presentations.
Here is an example of a line graph that shows the total cost of buying shirts for 0 through 15 shirts:
```markdown
# Total Cost of Buying Shirts
```code
| Number of Shirts | Total Cost ($) |
|------------------|----------------|
| 0 | 0 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 6 | 60 |
| 7 | 70 |
| 8 | 80 |
| 9 | 90 |
| 10 | 100 |
| 11 | 99 |
| 12 | 108 |
| 13 | 117 |
| 14 | 126 |
| 15 | 135 |
```
$$
y = \begin{cases}
10x & \text{if } x \leq 10 \\
9x + (10 - x) & \text{if } x > 10
\end{cases}
$$
a line graph with number of shirts on the x-axis and total cost on the y-axis
```