Answer:
The slope is -1/9
Explanation:
There are endless possibilities of equations, but if slope is what you're asking for, the slope of a line perpendicular to another is its opposite reciprocal, which is basically the number that when multiplied to the other slope is equivalent to -1. 9 * (-1/9) is -1, which means that it is the opposite reciprocal.
Answer: The slope is -1/9, there are endless amounts of equations that are perpendicular to the line, but the thing that they all have in common is a slope of -1/9.