Question

Whats the y-intercept value:

Y=11.5 times X + 1 +3.3

Answer 1

4.3

Answer 2

got it?

Answer 3

I got that, but I thought it was 0.

Answer 4

Its supposed to be the y intercept of a graph I'm working on, and it intercepts y at 0,0

Answer 5

y=mx +c , right??

Answer 6

not really. Here's what it looks like: http://img269.imageshack.us/i/grapheo.png/

Answer 7

the trendline intercepts the y axis at 0,0

Answer 8

hey ankur?

Answer 9

anyone?

Answer 10

y= 11.5x + 1t +3.3

Answer 11

did you make that graph or is it part of the problem?

Answer 12

i made the graph.

Answer 13

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

Answer 14

no, that graph looks like it is going to intersect the y axis at about 4.3

Answer 15

you made that graph based on your equation, right?

Answer 16

why don't you extend the line on the graph and see where it meets the y axis?

Answer 17

yes i did

Answer 18

and?

Answer 19

I did make it based on my equation, and i did extend the trendline.

Answer 20

the trendline hits 0,0

Answer 21

if you made the graph based on your equation, then it will automatically intersect the y axis at 4.3

Answer 22

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

Answer 23

actually, it will hit the y axis at 3.3

Answer 24

because your x axis includes the teacher

Answer 25

wait, what is your input? Is it the number of students ?

Answer 26

how do you reckon I can fix this?

Answer 27

number of students +1 teacher

Answer 28

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.

Answer 29

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?

Answer 30

I'm not sure anymore. Its linear:

C$=11.5 x N+ 1 + 3.3

Answer 31

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.

Answer 32

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.

Answer 33

but if you are taking the number of students alone as your input, then you have to do the N+1 business.

Answer 34

wait I think i get it now, so N should be students +1 teacher

Answer 35

1 teacher is always present no matter what. Its only the number of students who change.

Answer 36

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

Answer 37

i think the 3.3 is additional charge for adult.

Answer 38

so your y intercept should be 14.8, where your x axis is the number of students alone(not including the teacher)

Answer 39

i think you're right abuot the 3.3

Answer 40

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.

Answer 41

so plot your graph with x axis as the number of students alone.

Answer 42

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.

Answer 43

got it?

Answer 44

please let me know if I have clarified your doubt. If there is no feedback, I cannot know whether to continue explaining or not.

Answer 45

how can i put that in a two column table

Answer 46

Thanks for your help btw, I appreciate it.

Answer 47

input (# of students N) | output (Cost)
0 | 14.8
1 | 14.8+11.5
...... and so on

Answer 48

n of students (+1 teacher)

Answer 49

N is a variable, right? the teacher is always present. so he is constant. Only the number of students changes.

Answer 50

I gave you the equation too:
y = (N+1)11.5 +3.3
y = 11.5N +14.8

Answer 51

yeah i know the 1 teacher is always present, always constant, and the number of students changes

Answer 52

right, so what is the confusion?

Answer 53

What title i have for that column

Answer 54

Total Number of Students + 1 teacher

Answer 55

and below that, '1' because theres 0 students, but 1 teacher

Answer 56

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.

Answer 57

note that there is no x-intercept for this equation.

Answer 58

yup.

Answer 59

ill change that now...stay here though I reckon ive got more questions

Answer 60

Quick question, what is$11.50 after a 10% price rise? and $14.80

Answer 61

what is 10% of 11.5?

Answer 62

10 x 11.5 x100?

Answer 63

no that wasnt right

Answer 64

no kidding

Answer 65

of is times

Answer 66

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.

Answer 67

So if your company makes 200 dollars profit, and your share is 20 % of the profit, you make 20/100 of 200 = 20 dollars.

Answer 68

got it?

Answer 69

$12.30? Is that the 10% price increase?

Answer 70

sorry, that should have been 40.

Answer 71

no

Answer 72

what is 10% of 11.5?

Answer 73

$11.50 + 1.15= $12.65 ?????

Answer 74

wait my mistake, $12.65

Answer 75

great.

Answer 76

similarly find 10% increase in 14.8

Answer 77

I went 10x11.50 and then the % button

Answer 78

then added that to 11.50

Answer 79

understand what percent means and you wont have any confusion even if you have to do it without a calculator. see above.

Answer 80

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.

Answer 81

okay so 10 % increase in 14.8 is 14.8+1.48

Answer 82

yup got it.

Answer 83

Number of Students (+1 teacher) | Cost
1 | 14.80

Answer 84

my maths teacher wanted me to add the +1 to the amount of students+1 teacher column

Answer 85

Then your variable is not number of students. your variable is class size.

Answer 86

in that case, it does not have a y intercept.

Answer 87

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

Answer 88

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.

Answer 89

Please explain what your way (again!)

Answer 90

y = 11.5N +14.8
plot that graph. x axis is number of students.
y axis is cost.

Answer 91

see above.

Answer 92

or you can do it your way, if you shift the origin from 0,0 to 1,0

Answer 93

so its Cost=11.5 times Number of students plus 1 teacher's price

Answer 94

yes.

Answer 95

ok, so thats the formula down.

Answer 96

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.

Answer 97

How about the table? I'll show you what it looks like now: http://img839.imageshack.us/i/tableup.png/

Answer 98

ive been asked to use different numbers of the students, it doesnt have to be 1,2,3,4,5,6 etc.