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March 8th, 2017, 04:44 PM  #1 
Senior Member Joined: Feb 2016 From: seattle Posts: 354 Thanks: 10  Sorry if I already submitted this.
I have be explained that this is another time that the y=mx+b I am not sure if I use the numbers that They already gave us in the problem or get the y or b somewhere else? Thanks for the help! 
March 8th, 2017, 04:56 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,549 Thanks: 1259 
two points on a line ... (3,885) and (22,1550) can you write an equation in the form $y=mx+b$ using those two points? what does the yintercept represent? 
March 8th, 2017, 07:15 PM  #3 
Senior Member Joined: Feb 2016 From: seattle Posts: 354 Thanks: 10 
thanks, so would I go for example 1550=35(22)+665? Thanks for the graph! 
March 9th, 2017, 10:55 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 17,175 Thanks: 1285 
No, as that is arithmetically incorrect. As found already, the (marginal) cost per chair is \$35. Hence the total cost for 0 chairs is \$885  3 * \$35 = \$780. That is the startup cost. The linear equation amounts to C = startup cost + x * \$35. Calculate that for x = 15 to find the total cost of making 15 chairs. 

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