The scale given is 7 inches = 1 yard. To find the scale factor as a fraction, we need to express both measurements in the same units.
1 yard is equal to 36 inches. Therefore, we can convert the scale to inches:
7 inches corresponds to 36 inches (1 yard), leading to the following ratio:
\[ \frac{7 \text{ inches}}{36 \text{ inches}} \]
Now, we need to simplify this fraction. We can simply keep it as it is since 7 and 36 have no common factors other than 1.
Thus, the scale factor of the drawing is:
\[ \frac{7}{36} \]
This represents the scale factor of the drawing in the simplest form.