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I got that, but I thought it was 0.
Its supposed to be the y intercept of a graph I'm working on, and it intercepts y at 0,0
y=mx +c , right??
not really. Here's what it looks like: http://img269.imageshack.us/i/grapheo.png/
the trendline intercepts the y axis at 0,0
y= 11.5x + 1t +3.3
did you make that graph or is it part of the problem?
i made the graph.
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
no, that graph looks like it is going to intersect the y axis at about 4.3
you made that graph based on your equation, right?
why don't you extend the line on the graph and see where it meets the y axis?
yes i did
I did make it based on my equation, and i did extend the trendline.
the trendline hits 0,0
if you made the graph based on your equation, then it will automatically intersect the y axis at 4.3
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
actually, it will hit the y axis at 3.3
because your x axis includes the teacher
wait, what is your input? Is it the number of students ?
how do you reckon I can fix this?
number of students +1 teacher
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.
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?
I'm not sure anymore. Its linear: C$=11.5 x N+ 1 + 3.3
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.
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.
but if you are taking the number of students alone as your input, then you have to do the N+1 business.
wait I think i get it now, so N should be students +1 teacher
1 teacher is always present no matter what. Its only the number of students who change.
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
i think the 3.3 is additional charge for adult.
so your y intercept should be 14.8, where your x axis is the number of students alone(not including the teacher)
i think you're right abuot the 3.3
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.
so plot your graph with x axis as the number of students alone.
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.
please let me know if I have clarified your doubt. If there is no feedback, I cannot know whether to continue explaining or not.
how can i put that in a two column table
Thanks for your help btw, I appreciate it.
input (# of students N) | output (Cost) 0 | 14.8 1 | 14.8+11.5 ...... and so on
n of students (+1 teacher)
N is a variable, right? the teacher is always present. so he is constant. Only the number of students changes.
I gave you the equation too: y = (N+1)11.5 +3.3 y = 11.5N +14.8
yeah i know the 1 teacher is always present, always constant, and the number of students changes
right, so what is the confusion?
What title i have for that column
Total Number of Students + 1 teacher
and below that, '1' because theres 0 students, but 1 teacher
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.
note that there is no x-intercept for this equation.
ill change that now...stay here though I reckon ive got more questions
Quick question, what is$11.50 after a 10% price rise? and $14.80
what is 10% of 11.5?
10 x 11.5 x100?
no that wasnt right
of is times
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.
So if your company makes 200 dollars profit, and your share is 20 % of the profit, you make 20/100 of 200 = 20 dollars.
$12.30? Is that the 10% price increase?
sorry, that should have been 40.
what is 10% of 11.5?
$11.50 + 1.15= $12.65 ?????
wait my mistake, $12.65
similarly find 10% increase in 14.8
I went 10x11.50 and then the % button
then added that to 11.50
understand what percent means and you wont have any confusion even if you have to do it without a calculator. see above.
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.
okay so 10 % increase in 14.8 is 14.8+1.48
yup got it.
Number of Students (+1 teacher) | Cost 1 | 14.80
my maths teacher wanted me to add the +1 to the amount of students+1 teacher column
Then your variable is not number of students. your variable is class size.
in that case, it does not have a y intercept.
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
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.
Please explain what your way (again!)
y = 11.5N +14.8 plot that graph. x axis is number of students. y axis is cost.
or you can do it your way, if you shift the origin from 0,0 to 1,0
so its Cost=11.5 times Number of students plus 1 teacher's price
ok, so thats the formula down.
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.
How about the table? I'll show you what it looks like now: http://img839.imageshack.us/i/tableup.png/
ive been asked to use different numbers of the students, it doesnt have to be 1,2,3,4,5,6 etc.
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.
Yeah fair point. So what do you suggest I do with the table?
your table should read class size( teacher NOT included) and use the formula y = (N+1)11.5 +3.3
so for N = 0 , y = 14.8 N=1 y = 26.3 and so on.
I'm using 'Class size (teacher included in price)'
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.
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.
hang on, you changed it from y = 11.5N +14.8 to y = (N+1)11.5 +3.3
dude, both are the same equation. Think about it before you post this silly stuff.
its just proper semantics, that's all. y = (n+1)11.5 + 3.3 conveys the proper meaning of the equation.
i'll stick with y = 11.5N +14.8, we're not using brackets/parenthesis currently in class
ok. thats up to you
i added a trendline, and displayed the equation on the chart but it says: y = 11.13x + 11.194 R² = 0.9993
i know whats wrong, the class number still had the teacher added.
now its: y = 11.5x + 14.8 R² = 1 a perfect r2 value!
what is R2 ? You can't expect people to know what you are talking about. you seem to be using some sort of software.
is that good or bad that r2 is 1?
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.
I probably know it. But i may have called is Z squared. What is R?
The y-intercept (for the graph) is (0, 14.8)
The question says explain why it is this value
I say its because its linear, and it has a perfect r2 value, but I dont think thats right
it is that value because thats the price of the ticket for an adult. Duh!
you are welcome. Please tell me your problem's done! :)
so far every other question is going along smoothly, now I understand it better, thanks for your help.
just hang around a bit longer....
you are welcome
just figured out slope by myself :D
Last question now! :)
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!?