Well, for each [tex]h[/tex] hour you work, you are going to earn [tex]d[/tex] dollars.
Given that we are keeping a constant rate of adding [tex]d[/tex] given the number of hours [tex]h[/tex], we can say that [tex]T[/tex] is the following:
[tex]T = hd[/tex]
For example, working at 8 dollars per hour will get the following equation:
[tex]T = 8h[/tex]
For every hour you work, you receive another 8. Thus, we are multiplying them together.
The final equation is T = hd.
