I’ll mark you brainlist write in y=mx+b form

Step-by-step explanation:

The rate of change is the same as the slope (m variable), and in this sense you don't have to write out -1x, you can just keep it at -x. The point you are given is the point where the line crosses the y axis, which is called the y-intercept and is the variable b in your equation. This is because the x coordinate is zero, so it has to be where the line crosses the y axis. Just put that -4 in as your b variable, and there's your answer!