By: Baylee McBride

 Sally is trying to figure out how much her bill cost for texting each month for 6 months. She sent 102, 105, 122, 127, 139, and 155 text messages. If text messages cost 10 cents per text how much money did it cost each month?

The independent variable is my x value which is the number of text messages sent. The dependent variable is my y value which is the cost of the bill per month. We know that y DEPENDS on x. So the total cost of her bill per month DEPENDS on the number of text messages she sends per month. Y axis dependentdependent I n d e p e n d e n t

XX(.10)YX,Y (.10) , (.10) , (.10) , (.10) , (.10) , (.10) ,15.50

 Domain is the x values.  Range is the y values.  So my domain is {102, 105, 122, 127, 139, 155}  My range is {10.20, 10.50, 12.20, 12.70, 13.90, 15.50}

 Since my data contains only points and not a line, then it is a discrete graph.  You can not send 100 ½ texts, you can only send 101, 102, or 103 texts. So we will not use any of the numbers between 101 and 102.

 A function is where each x value has a unique y value.  This means that the x values CAN NOT repeat.  Since my X values do not repeat, then it IS a FUNCTION.

Y axis X axis

 So the totals for the months were ……..  1 st month- $10.20  2 nd month- $10.50  3 rd month- $12.20  4 th month- $12.70  5 th month- $13.90  6 th month- $15.50