anonymous
  • anonymous
Whats the y-intercept value: Y=11.5 times X + 1 +3.3
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
4.3
anonymous
  • anonymous
got it?
anonymous
  • anonymous
I got that, but I thought it was 0.

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anonymous
  • anonymous
Its supposed to be the y intercept of a graph I'm working on, and it intercepts y at 0,0
anonymous
  • anonymous
y=mx +c , right??
anonymous
  • anonymous
not really. Here's what it looks like: http://img269.imageshack.us/i/grapheo.png/
anonymous
  • anonymous
the trendline intercepts the y axis at 0,0
anonymous
  • anonymous
hey ankur?
anonymous
  • anonymous
anyone?
anonymous
  • anonymous
y= 11.5x + 1t +3.3
anonymous
  • anonymous
did you make that graph or is it part of the problem?
anonymous
  • anonymous
i made the graph.
anonymous
  • anonymous
The problem is I have an answer for the y-intercept of the equation (4.3, which I don't want to know), when I need to know the y-intercept of that graph, which I think is 0,0
anonymous
  • anonymous
no, that graph looks like it is going to intersect the y axis at about 4.3
anonymous
  • anonymous
you made that graph based on your equation, right?
anonymous
  • anonymous
why don't you extend the line on the graph and see where it meets the y axis?
anonymous
  • anonymous
yes i did
anonymous
  • anonymous
and?
anonymous
  • anonymous
I did make it based on my equation, and i did extend the trendline.
anonymous
  • anonymous
the trendline hits 0,0
anonymous
  • anonymous
if you made the graph based on your equation, then it will automatically intersect the y axis at 4.3
anonymous
  • anonymous
No, you must have made some mistake. if the line on the graph is the equation, then it has to intersect the y axis at 4.3
anonymous
  • anonymous
actually, it will hit the y axis at 3.3
anonymous
  • anonymous
because your x axis includes the teacher
anonymous
  • anonymous
wait, what is your input? Is it the number of students ?
anonymous
  • anonymous
how do you reckon I can fix this?
anonymous
  • anonymous
number of students +1 teacher
anonymous
  • anonymous
its the number of the students plus 1 teacher, and the other value is the total cost of the movie tickets for that amount of students + 1 teacher.
anonymous
  • anonymous
so lets call that class size. so the x axis is the class size. and the y axis is the cost. what is 3.3?
anonymous
  • anonymous
I'm not sure anymore. Its linear: C$=11.5 x N+ 1 + 3.3
anonymous
  • anonymous
see, your input cannot be N+1. It is either the number of students alone or the number of students plus a teacher, who is always present.
anonymous
  • anonymous
if you are taking your input as the total number of people who are going to the theater, then it should not matter if one of them is a teacher.
anonymous
  • anonymous
but if you are taking the number of students alone as your input, then you have to do the N+1 business.
anonymous
  • anonymous
wait I think i get it now, so N should be students +1 teacher
anonymous
  • anonymous
1 teacher is always present no matter what. Its only the number of students who change.
anonymous
  • anonymous
so, if the number of students is 0, the teacher still ends up going to the theater by himself and pays the adult ticket price. which is 11.5 +3.3
anonymous
  • anonymous
i think the 3.3 is additional charge for adult.
anonymous
  • anonymous
so your y intercept should be 14.8, where your x axis is the number of students alone(not including the teacher)
anonymous
  • anonymous
i think you're right abuot the 3.3
anonymous
  • anonymous
so then total cost is y = 11.5(N+1)+3. that is, 11.5 dollars for each ticket for all the students and teacher, plus 3.3 for the adult charge.
anonymous
  • anonymous
so plot your graph with x axis as the number of students alone.
anonymous
  • anonymous
then your y intercept will be if no students come for the class movie trip, that is, the adult teacher alone goes. so he will be charged 11.5 dollars, which is the charge for everyone +3.3 dollars for being adult.
anonymous
  • anonymous
got it?
anonymous
  • anonymous
please let me know if I have clarified your doubt. If there is no feedback, I cannot know whether to continue explaining or not.
anonymous
  • anonymous
how can i put that in a two column table
anonymous
  • anonymous
Thanks for your help btw, I appreciate it.
anonymous
  • anonymous
input (# of students N) | output (Cost) 0 | 14.8 1 | 14.8+11.5 ...... and so on
anonymous
  • anonymous
n of students (+1 teacher)
anonymous
  • anonymous
N is a variable, right? the teacher is always present. so he is constant. Only the number of students changes.
anonymous
  • anonymous
I gave you the equation too: y = (N+1)11.5 +3.3 y = 11.5N +14.8
anonymous
  • anonymous
yeah i know the 1 teacher is always present, always constant, and the number of students changes
anonymous
  • anonymous
right, so what is the confusion?
anonymous
  • anonymous
What title i have for that column
anonymous
  • anonymous
Total Number of Students + 1 teacher
anonymous
  • anonymous
and below that, '1' because theres 0 students, but 1 teacher
anonymous
  • anonymous
X axis is the number of students. x axis is the independent variable. y depends on x, so y axis is the dependent variable. the titles of x axis and y axis should be # of students and Cost, respectively.
anonymous
  • anonymous
note that there is no x-intercept for this equation.
anonymous
  • anonymous
yup.
anonymous
  • anonymous
ill change that now...stay here though I reckon ive got more questions
anonymous
  • anonymous
Quick question, what is$11.50 after a 10% price rise? and $14.80
anonymous
  • anonymous
what is 10% of 11.5?
anonymous
  • anonymous
10 x 11.5 x100?
anonymous
  • anonymous
no that wasnt right
anonymous
  • anonymous
no kidding
anonymous
  • anonymous
of is times
anonymous
  • anonymous
cent = century = 100. percent = per- cent. per = for every. per-cent = for every 100. so if your share of profits is 10percent of total profit, it means you get 10 dollars for every 100 dollars the company makes. so you make 10/100 of what the company makes.
anonymous
  • anonymous
So if your company makes 200 dollars profit, and your share is 20 % of the profit, you make 20/100 of 200 = 20 dollars.
anonymous
  • anonymous
got it?
anonymous
  • anonymous
$12.30? Is that the 10% price increase?
anonymous
  • anonymous
sorry, that should have been 40.
anonymous
  • anonymous
no
anonymous
  • anonymous
what is 10% of 11.5?
anonymous
  • anonymous
$11.50 + 1.15= $12.65 ?????
anonymous
  • anonymous
wait my mistake, $12.65
anonymous
  • anonymous
great.
anonymous
  • anonymous
similarly find 10% increase in 14.8
anonymous
  • anonymous
I went 10x11.50 and then the % button
anonymous
  • anonymous
then added that to 11.50
anonymous
  • anonymous
understand what percent means and you wont have any confusion even if you have to do it without a calculator. see above.
anonymous
  • anonymous
So I go 10 for every 100, divide 14.80 by 10. I remember that, just jump the decimal backwards to divide by how many zeros.
anonymous
  • anonymous
okay so 10 % increase in 14.8 is 14.8+1.48
anonymous
  • anonymous
yup got it.
anonymous
  • anonymous
Number of Students (+1 teacher) | Cost 1 | 14.80
anonymous
  • anonymous
my maths teacher wanted me to add the +1 to the amount of students+1 teacher column
anonymous
  • anonymous
Then your variable is not number of students. your variable is class size.
anonymous
  • anonymous
in that case, it does not have a y intercept.
anonymous
  • anonymous
this is heaps frustrating for me. its due tonight in the next few hours. and I dont understand much about maths, I'm really poor at it
anonymous
  • anonymous
okay, for y intercept ti exist, the class size has to be zero. But the way you have defined your independent variable as (amount of students+1), your variable cannot be zero even if amount of students is 0. Do it my way. It is correct.
anonymous
  • anonymous
Please explain what your way (again!)
anonymous
  • anonymous
y = 11.5N +14.8 plot that graph. x axis is number of students. y axis is cost.
anonymous
  • anonymous
see above.
anonymous
  • anonymous
or you can do it your way, if you shift the origin from 0,0 to 1,0
anonymous
  • anonymous
so its Cost=11.5 times Number of students plus 1 teacher's price
anonymous
  • anonymous
yes.
anonymous
  • anonymous
ok, so thats the formula down.
anonymous
  • anonymous
yes, if you do it your math teacher's way, then it doesn't make any sense. The cost would be 3.3 even if no one, including the teacher went.
anonymous
  • anonymous
How about the table? I'll show you what it looks like now: http://img839.imageshack.us/i/tableup.png/
anonymous
  • anonymous
ive been asked to use different numbers of the students, it doesnt have to be 1,2,3,4,5,6 etc.
anonymous
  • anonymous
yes, but if no-one goes in your teacher's method, the y-intercept is 3.3. So that means that the class pays 3.3 and no one goes, not even the teacher. In my way, if no one goes, it means only the students don't go. The teacher still goes no matter what. My way makes more sense than your math teacher's way.
anonymous
  • anonymous
Yeah fair point. So what do you suggest I do with the table?
anonymous
  • anonymous
your table should read class size( teacher NOT included) and use the formula y = (N+1)11.5 +3.3
anonymous
  • anonymous
so for N = 0 , y = 14.8 N=1 y = 26.3 and so on.
anonymous
  • anonymous
I'm using 'Class size (teacher included in price)'
anonymous
  • anonymous
I guess, though I am not totally comfortable with that. You can argue with your teacher that his/her way does not make sense. you might get bonus points for that.
anonymous
  • anonymous
its correct, but it shouldn't read that. because it is a variable that you are defining as class size. It has no other attributes.
anonymous
  • anonymous
hang on, you changed it from y = 11.5N +14.8 to y = (N+1)11.5 +3.3
anonymous
  • anonymous
dude, both are the same equation. Think about it before you post this silly stuff.
anonymous
  • anonymous
its just proper semantics, that's all. y = (n+1)11.5 + 3.3 conveys the proper meaning of the equation.
anonymous
  • anonymous
i'll stick with y = 11.5N +14.8, we're not using brackets/parenthesis currently in class
anonymous
  • anonymous
ok. thats up to you
anonymous
  • anonymous
i added a trendline, and displayed the equation on the chart but it says: y = 11.13x + 11.194 R² = 0.9993
anonymous
  • anonymous
i know whats wrong, the class number still had the teacher added.
anonymous
  • anonymous
now its: y = 11.5x + 14.8 R² = 1 a perfect r2 value!
anonymous
  • anonymous
what is R2 ? You can't expect people to know what you are talking about. you seem to be using some sort of software.
anonymous
  • anonymous
is that good or bad that r2 is 1?
anonymous
  • anonymous
I thought you'd know that! R squared value. I don't know much about it, but I remember that if its 1 its perfect, if its below, its not great.
anonymous
  • anonymous
I probably know it. But i may have called is Z squared. What is R?
anonymous
  • anonymous
The y-intercept (for the graph) is (0, 14.8)
anonymous
  • anonymous
right,.
anonymous
  • anonymous
The question says explain why it is this value
anonymous
  • anonymous
I say its because its linear, and it has a perfect r2 value, but I dont think thats right
anonymous
  • anonymous
it is that value because thats the price of the ticket for an adult. Duh!
anonymous
  • anonymous
lol thanks
anonymous
  • anonymous
you are welcome. Please tell me your problem's done! :)
anonymous
  • anonymous
almost.
anonymous
  • anonymous
so far every other question is going along smoothly, now I understand it better, thanks for your help.
anonymous
  • anonymous
just hang around a bit longer....
anonymous
  • anonymous
you are welcome
anonymous
  • anonymous
just figured out slope by myself :D
anonymous
  • anonymous
congratulations.
anonymous
  • anonymous
Last question now! :)
anonymous
  • anonymous
Write a mathematical model for the total cost for a class to visit the movies if the cost for 1 student is $s and for 1 teacher is $t when N students and 1 teacher attends Help!?

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