You can talk on the phone y minutes on day x of month according to the equation y=2x+1 the cell phone company clams you talked 1
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This function starts at , so we have
.
Then, every time increments by 1,
doubles. This is typical of exponential functions. In linear functions, every time
increments by 1,
increments by a fixed amount (the slope of the function).
So, this is an exponential function, and the equation is