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Algebra Problem Need some help?
A sales person observes that if an item is priced at $5 per item then 4 items are sold. If it is priced at $7 per item, 2 items are sold. Find an equation to model the number y of items sold for x dollars per item.
it's for my algebra II class thank you.
Thank You to all of you who answer!!!!
3 Answers
- 1 decade agoFavorite Answer
You are given a set of ordered pairs:
(cost per item, items sold)
(5,4) and (7,2)
From this you can determine the slope
(y2-y1)/(x2-x1) = (2-4)/(7-5) = -2/2 = -1
you need to solve for the y-intercept:
4 = -1 ( 5) + b
9 = b
your final equation is y = -x + 9
- Davis PLv 71 decade ago
N is number of items sold
P is price
N = a P + b
4 = 5a + b
2 = 7a + b
-2 = 2 a
a = -1
b = 9
N = -1 P + 9
sorry we were to use y and x
y = - x + 9
- weaselLv 41 decade ago
yes, i think they are really good answers below. I was looking at it down on paper and then pressed my refresh button and u had 2 answers. good luck, algebra is so brain numbing.. i just did it last year and it is sooooooooooo hard.
