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September 2nd, 2015, 04:40 PM  #1 
Newbie Joined: Mar 2015 From: Chicago Posts: 22 Thanks: 1  Electric company cost problem and explanation?
An electric company charges its customers a base rate of $10 a month plus 6 cents per kilowatthour(kWh) for the first 1200 kWh and 7 cents per kWh for all usage over 1200 kWh. Express the monthly cost E as a function of the amount of electricity used. Then graph the function E 0 =< x =< 2000. I got this: 10(0.06  x) if 0 =< x < 0.06 x { 0 if 0.06 =< x =< 0.07 10(x  7) if x > 0.07 How do I graph it? I have no idea. 
September 2nd, 2015, 05:31 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733 
Your formulas are completely wrong. I assume E is $ charged, and x is usage. E=10+.06x, x<1200 E=82+.07x, x>1200 

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