Precalculus Steinmetz High School: September 2010

Thursday, September 30, 2010

why isn't there a blog for today?

Notes for 9-29-10

Agenda

I bell ringer

II linear function

III domain and range

Objective: students will define functions and identify domains

big picture: linear functions can be used to model real world situations

Page 24 # 18 Example

$ 12000 cost of computer

depreciate by 10% of the purchase price each year. annually $1200

V(y)=-1200y+12000

What is the computer worth after 3 years

V(3)=-1200(3)+12000

V(3)=$8400

Range and domain

valid input

(x)

0 is less than or equal to y is less than or equal to 10

input

0 less than or equal to p() is less than or equal to12000

answer

HOMEWORK IS PAGE 24 #18,20,21

Wednesday, September 29, 2010

???

i still dont completly understand how to do the homework....help??

where are the notes for today

Sunday, September 26, 2010

this is a pain in the bum>_<

i am not following anything in class and I can't find any of the bloggers posts from last week. I am unhappy. very unhappy:((((

Friday, September 24, 2010

Who was in charge of the blog. i have no clue of what we were doing with the functions stuff. i kind of understand it but then i don't.

Thursday, September 23, 2010

why isn't there a blog from Wednesday or today...this things so confusing....

more explanation needs to be going on in class....

hey

honestly i dont understand what is being taught in this class.
what could i possibly do to understand/bring my grade up??

Wednesday, September 22, 2010

hey

I hope I get some points for doing this!!!! Dakota

Tuesday, September 21, 2010

Homework

why does the book have any examples of how to do problems that are given in the homework assigment

melania gomez

the home work for today is page 23 (11-14) , mostly the same homework from yesterday. and she might collect the homework tomorrow MAYBE.

Pre-Cal Notes 9/21/10 Period 3

Bell Ringer
Go over Quiz
No Homework

Example #3: C(m)= 580(m)= $2,000

Input is positive intergers: domain.

Outpt is positive intergers greater than or equal to $2,000: range.

Homework

Was there any homework assigned for today???

??

what was the homework assigned yesterday?? where are the notes?

what up miss ssssssssssssssssss.....

Monday, September 20, 2010

I don't get the homework at all. How I am supose to do it

Friday, September 17, 2010

Where are the notes from yesterday? that's what I need help with, I think. i forgot if that was when we did the functions.
Mercedes Reyes

Wednesday, September 15, 2010

It's going to be 50 tickets to tie the sum and 51 to make profit

Agenda
i. Bell Ringer
ii. Home Work Review
iii. Linear Equations

Objective: Students will be able to model real world situations as linear functions.

i. Bell Ringer

find the equation of the two points (3,5)(2,1)

m=1-5 =-4 4 being you slope
---- --- = 4
2-3 -1

So now plug it in
y-y1=m(x-x1)
y-5=4(x-3)
y-5=4x-12
y=4x-7
* both in bold could be used as a answer

Find the equation of a parallel line
- since its parallel it has the same slope
y=4x-8 <<
Find the equation of a line to (-8,4)
y-4=--1/4(x- -8)
y - 4 = -1/4 (x + 8)
y - 4 = -1/4x - 2
y=-1/4+2

ii. Home Work Review
5.
(-1,4) (5,-8) find the slope

8 - 4 4 2
----- = -- = --
5 +1 6 3
y-4 = 2/3 (x+1)

7.
(5,-7)
if its horizontal y stays the same
y = -7
if its a vertical x stays the same
x= 5
14.
x-3y = 9
-x -x
-3y = -x +9
---- ------
-3 -3 -3

y= 1/3x -3

9.
(2,-7) (2,3)
if m is undefined the equations is xb

I'M NOT ADDING THE LAST 2

iii. pg 19 Linear Functions
f (x) = 1x+3
g(x) = 3x-2
l(T) = 0.0001T+10
g(s) = -1.2s +4.7
h(t) = 3

pg. 20
Rent was $200 p= profit
Tickets were $5
p(t) = 5t - 200 t= tickets
0>5t - 200
+200 + 200

200>5t
--- --
5 5
40>t

-------------------------------------------------------
Question;
1. How many people a dropping this class? (j/k)

2. If I'm throwing a party and I have to pay 150 for the dj , 200 for the location and and 150 food how many $10 tickets do I have to sell to start making a profit?
--------------------------------------------------------

this took forever =[

Tuesday, September 14, 2010

Natalia Buza

9-14-10

Objective: Students will be able to find parallel and perpendicular lines to a given line.

Parallel:
y=5x+7
y=5x+2
y=5x+1
y=5x-1,000,000,000

**If they have the same slope their parallel

y=3x+2
y=1/3x
(2,-4)- point of intersection
-4=1/3(2)+b
-4=2/3+b
-42/3=b

2 ways to find where perpendicular intersect
1st-subtract

y=4x+5
-(y=-1/4x+3)
--------------
0=4.25x+2
-2 -2
--------------
-2 = 4.25x
--- -----
4.25 4.25

-200 = -8
----- ---
425 17

y=4(8/17)+5
=53
--
17
(-8/17, 53/17)

2nd way:calculator

4x-y=-5
-1/4x-y=-3
[4 -1 -5
-1/4 -1 -3]

hw: pg 16 5-14

Monday, September 13, 2010

Michelle Ramirez September 13, 2010

Notes- Solving systems of equations

3x+5y=7
2x-4y=2

1.intersect at 1 and only one point
2.infinitely many-some lin
3.never intersect-parallel line

Calculator
1.2nd
2.matrix
3.edit
4.enter matrix[A] 2x3 [3 5 7]
[2 14 2]

Tytiana Whiteside Sept.10, 2010

Y-intercept
y=mx+b (m-slope)(b-y intercept)

Standard Form
Ax+By=C

Point Slope Form
Y-Y1=m(x-x1) (m-slope)

Given Segment Line AB A=(-5,2) B=(-7,8)
To find the midpoint
(x1+x2/2, y1+y2/2)
(-7+-5/2, 2+8/2) =(-6,5)

To find the distance
d=The square root of (x2-x1) to the 2nd power + (y2-y1) to the 2nd power
d= The square root of (2) to the 2nd power + (-6) to the 2nd power
4+36
d= square root of 40
d=2 the square root of 10
Ax+By=C
Matrix Function
2nd Maqtrix
Edit 2x3
3x+7y=-5
2x-4y=2
[3 7 -5]
[2 -4 2]

2nd Quit
2nd Matrix
Math
rref (B0
2nd Matrix
rref ([A])
[1 0 -3/13]
[0 1 -8/13]

Homework page 4 #1-8

HEy yall.!

Michelle Ramirez

Saturday, September 11, 2010

hey

Friday, September 10, 2010

today i learned how to use a calculator. yay!!!

Finally!! Hey Ms. Sullivan!

HI CORY!!!!!!!! =D

heyy

i got it to work

IM IN!
NATHAN DAVILA!