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rebelchick777
 2 years ago
I need some help please. Write a function rule to describe each statement...
the cost in dollars of printing dollar bills when it costs 3.8cents to print a dollar bill.
the amount of money you earn mowing lawns at $15 per lawn.
the profit you make selling flowers at $1.50 each when each flower costs you $.80
rebelchick777
 2 years ago
I need some help please. Write a function rule to describe each statement... the cost in dollars of printing dollar bills when it costs 3.8cents to print a dollar bill. the amount of money you earn mowing lawns at $15 per lawn. the profit you make selling flowers at $1.50 each when each flower costs you $.80

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tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0it costs 3.8 cents to print 1 dollar its costs 2 times 3.8 cents to print two dollars it costs 3 times 3.8 cents to print 3 dollars you can see a pattern here right?

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0yeah,but how do i write them as function rules?

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0we use variables! there should be two of them; one will represent the number of dollars, lets call that x and the other will represent the cost to print them, lets call that y

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0my teacher told me to write the functions as f(x)=...

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0ok lets use f(x) instead of y so the cost to print, f(x), should equal the number of dollars, x, times 3.8 cents

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0ok so then for the second one would it be... f(x)=$15x

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0but actually I made a mistake on the first one

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0I d dont understand how to write the third one though.

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0the function for the first part should give us the cost in dollars, with f(x) = 3.8x we'll end up with the number of cents

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0so you just convert 3.8 cents into dollars which should be .038

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0the profit you make selling flowers at $1.50 each when each flower costs you $.80

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0what is the profit if I sell one flower?

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0right.. and if i sell two flowers?

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0a dollar and 40 cents

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0which is the same as 2 times 70 cents right? if I sell 3 flowers the profit would be 3 times 70 cents and if I sell x flowers the profit will be x times 70 cents

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0ok so... would the function be f(x)=.70x?

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0Thanks. Now i have another question i have this equation... f(x)=$0.59x where x+number of pounds. if i had $10 to buy that turkey how big a turkey could i buy?

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0you have f(x) = $0.59x which in words is, the cost of a turkey, f(x), is the number of pounds, x, times 59 cents

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0so the cost of a turkey is a function of the number of pounds that it weighs, does that make sense so far?

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0yeah. i was wondering where you d plug in the $10.

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0the ten dollars goes where dollars is represented in the equation

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0x is pounds f(x) is dollars so the equation, when we put in 10 dollars, becomes $10 = $0.59x

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0and by solving for x you will have found out how big a turkey you could by with 10 dollars

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.016.95lb. is what i got. Yeah it does make sense.

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1350441039671:dw

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1350441111447:dw

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0i dont see the rule for either of these. It says to write a function rule. By the way.. they are two seperate questions.

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0ok lets start with the top one we need to find a way to relate x and y in other words we need to be able to describe how much y changes when x changes we can do this with a function y = x times (some number)

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0i know that,but idk what number it should be.,

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0we can find out what number it is by calculating the slope between the points that are given

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0with m = (y2y1)/(x2x1)

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0ok. so what should i get?

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0lets use the points: (0,1) and (1,3) m = (31)/(10) = 2

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0i understand it for the second table the answer would be f(x)=4.5x. But i still dont see a pattern in the first one.

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0maybe graphing the points and seeing them line up would help

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0the y's are going up by two except for the last one.

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0because its a negative x in the last one, if it were positive 3 then y would be 7

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0thats the pattern if we follow the negative x points

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0the reason it isnt as easy to see as the second problem is because this function will have the form y = mx + b

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0whereas the second one was just y = mx

rebelchick777
 2 years ago
Best ResponseYou've already chosen the best response.0ok so whats the function rule.

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0well we're using y = mx + b as the template for our function, we found m to be 2, now we need to find b

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0so we have y = 2x + b since we're given points we can substitute one in for the values of x and y, and then solve for b so if we use (0,1) as our point we get 1 = 2(0) + b so b = 1

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0and keep in mind that we could have used any of the points that were given for example if we used (2,5) we get 5 = 2(2) +b and again b = 1

tjones89
 2 years ago
Best ResponseYou've already chosen the best response.0so now that we know b, we can finally write the function as y = 2x 1
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