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yeah,but how do i write them as function rules?

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my teacher told me to write the functions as f(x)=...

so f(x)=3.8x

yes

ok so then for the second one would it be... f(x)=$15x

yep

but actually I made a mistake on the first one

I d dont understand how to write the third one though.

so you just convert 3.8 cents into dollars which should be .038

the profit you make selling flowers at $1.50 each when each flower costs you $.80

what is the profit if I sell one flower?

70 cents

right..
and if i sell two flowers?

a dollar and 40 cents

ok so... would the function be f(x)=.70x?

yes! good job

yeah. i was wondering where you d plug in the $10.

the ten dollars goes where dollars is represented in the equation

x is pounds
f(x) is dollars
so the equation, when we put in 10 dollars, becomes
$10 = $0.59x

and by solving for x you will have found out how big a turkey you could by with 10 dollars

does that make sense?

16.95lb. is what i got. Yeah it does make sense.

|dw:1350441039671:dw|

|dw:1350441111447:dw|

i know that,but idk what number it should be.,

we can find out what number it is by calculating the slope between the points that are given

with m = (y2-y1)/(x2-x1)

ok. so what should i get?

lets use the points: (0,1) and (1,3)
m = (3-1)/(1-0) = 2

maybe graphing the points and seeing them line up would help

the y's are going up by two except for the last one.

because its a negative x in the last one, if it were positive 3 then y would be 7

|dw:1350442466454:dw|

thats the pattern if we follow the negative x points

whereas the second one was just y = mx

ok so whats the function rule.

so now that we know b, we can finally write the function as
y = 2x -1

thank you.

np :)

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