It is known that the point M (p; -411) belongs to the graph of the function f (x) = – 9x – 6. Find the perimeter.

By the condition of the problem, we have an unknown number denoted by the conditional variable “X”.

Then, based on the data of the problem, we will compose the following equation: -411 = -9 x p – 6.

Solving this equation, we get -411 + 6 = -9 x p or -405 = – 9 x p or p = 45.

Therefore, the required unknown number is 45.

Answer: the unknown number you are looking for is 45.