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Jalissa bought a backpack for $30 and n notebooks for $2.50 each. a. Write a function that shows the amount Jalissa spent on her backpack and n notebooks. b. If she spent $40, how many notebooks did she
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Jan 22, 2017
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Jalissa bought a backpack for $30 and n notebooks for $2.50 each.
a. Write a function that shows the amount Jalissa spent on her backpack and n notebooks.
b. If she spent $40, how many notebooks did she buy?
Mathematics
high-school
Daniel Werner
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f(n) = 2.50n + 30....f(n) also represents y...so if u wanted to write y = 2.50n + 30...it would be the same.
if she spent 40....
40 = 2.50n + 30
40 - 30 = 2.50n
10 = 2.50n
10/2.50 = n
4 = n.....so she bought 4 notebooks
Eason Kang
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Jan 23, 2017
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Eason Kang
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y=2.5x+30 - the function where y = the total cost and x = the # of notebooks.
40 = 2.5x + 30 - Plug 40 into y and solve
10= 2.5x
x = 4, the number of notebooks she bought
SlappyTheFish
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Jan 28, 2017
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