Welcome to Bytelearn!

Let’s check out your problem:

Susan's cell phone plan includes unlimited texting. The amount she pays for texting each month can be described by the function $y = 20$, where $y$ is the number of dollars spent on texting as a function of $x$, the number of texts.$\newline$What is true about the function?$\newline$(A)It is linear because the rate of change is zero.$\newline$(B)It is linear because the rate of change is increasing.$\newline$(C)It is nonlinear because the rate of change is zero.$\newline$(D)It is nonlinear because the rate of change is increasing.