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March 8th, 2017, 04:44 PM   #1
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From: seattle

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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!
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March 8th, 2017, 04:56 PM   #2
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From: Texas

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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 y-intercept represent?
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 March 8th, 2017, 07:15 PM #3 Senior Member   Joined: Feb 2016 From: seattle Posts: 228 Thanks: 9 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: 16,595 Thanks: 1199 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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