Given a function y = 1-x, for what values of x is the value of the function 3?

A function y = 1 – x is given.

Determine for what values of x the value of the function is equal to 3.

Substitute the number 3 instead of y in the expression, and then we get the equation in the form:

3 = 1 – x;

We leave the unknown values on one side, and transfer the known values to one side. Then we get:

-x = 3 – 1;

-x = 2;

x = -2;

Answer: at x = -2.