By: Yakub Rabiutheen

 The number of lights on vs cost of electric bill.  It is a function because the number of Lights on effect how much you pay for your electric bill.  The Independent variable - How many lights are on.  The dependent variable - How much you pay.

Number of lights onTotal cost {$} Domain {15,16,17,18,19,20, 21,22,23,24,25} Range {30,32,34,36,38,40, 42,44,46,48,50}

 Domain {15,16,17,18,19,20,21,22,23,24,25}  Range  {30,32,34,36,38,40, 42,44,46,48,50}

Number of lights on X Y Total cost

2 dollars for each light on. Y=2x