math
posted by chchch .
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.

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)
= (430290)/(2013) = 140/7 = 20
equation:
y290 = 20(x13)
arrange it in any way you want.
e.g.
y = 20x  260 + 290
y = 20x + 30 would be the slopeyintercept form 
What is the answer for B
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