Posted by **chchch** on Thursday, July 5, 2012 at 10:09pm.

a company was charged $290 for 13 frames. it was charged $430 for 20 frames.

A. use the coordinates (13,290) and (20,430) to write a linear equation in point slope form that gives the relationship of the cost to the number of frames

B. find the cost for 25 frames.

- math -
**Reiny**, Thursday, July 5, 2012 at 10:19pm
You have posted 5 questions that are done the same way. I will do this one, and you do the previous 4

slope between the two points (13,290) and (20,430)

= (430-290)/(20-13) = 140/7 = 20

equation:

y-290 = 20(x-13)

arrange it in any way you want.

e.g.

y = 20x - 260 + 290

y = 20x + 30 would be the slope-yintercept form

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