Hi Surah,
I recommend typing that function into Desmos Graphing Calculator, using sliders for m and d. That way you can make adjustments to those two variables (with the restriction that they be positive) to see how the graph changes. Pay attention to what happens to the x and y intercepts. Of course, the simplest example is choosing a value of 1 for each.
Enjoy

Cary M.
11/28/22
Surah K.
How do I graph it without desmos. On SAT, I won't have that option11/28/22