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.
What is true about the function?

The function y = 20 describes a constant cost for texting regardless of the number of texts sent. This means that regardless of how many texts Susan sends in a month, she will always pay $20 for texting. So, it's true that Susan pays a fixed amount of $20 each month for texting, regardless of the number of texts she sends.

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. What is true about the function?

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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.
What is true about the function?