Someone please help , how do you solve this ?
The function f(x) = 1.50x + 12.50 relates how much Kelsey pays for digital service, f(x), to the number of movies, x, she streams in a month. What is the value and meaning of f(18)?
$27.00; this is the amount Kelsey pays for 18 months of service
$27.00; this is the amount Kelsey pays for 18 movies in 1 month
$39.50; this is the amount Kelsey pays for 18 months of service
$39.50; this is the amount Kelsey pays for 18 movies in 1 month

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- anonymous

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- welshfella

the x intercept is the value of x when y = 0
and y intecept is value of y when x = 0
so to find the x intercept
solve for x :-
3x - 2(0) = 18
3x = 18
x = ?

- anonymous

Hey sorry that was the wrong question because it dosnt make sense it's ... The function f(x) = 1.50x + 12.50 relates how much Kelsey pays for digital service, f(x), to the number of movies, x, she streams in a month. What is the value and meaning of f(18)?

- TheSmartOne

That's that same question though...?

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## More answers

- anonymous

Oh gosh nvm , and x=15

- TheSmartOne

wrong. You are multiplying the 3 to x. So you have to divide to get rid of it:
\(\sf\Large \frac{3x}{3}=\frac{18}{3}\)

- anonymous

x=6 then ?

- TheSmartOne

correct

- anonymous

Okay but now what ? What do i do with the 6?

- TheSmartOne

I don't know why @welshfella had you calculate the x-intercept... It is of no importance in the question :/

- TheSmartOne

f(x) = 1.50x + 12.50
They want to know what f(18) = ?
so plug in x=18 and tell me what you get :)

- anonymous

39.5

- TheSmartOne

correct.

- TheSmartOne

so what 2 answer choices can we eliminate?

- anonymous

A & b

- TheSmartOne

good job
and I think welshfella 's comment was for your previous question which you editted :p

- anonymous

Yes it was haha

- TheSmartOne

read this line:
The function f(x) = 1.50x + 12.50 relates how much Kelsey pays for digital service, f(x), to the number of movies, x, she streams in a month.
what do you think would be the answer between C and D?

- anonymous

D

- anonymous

- TheSmartOne

correct, great job :)

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