Question

Use function notation to write the equation of the line

Answer 1

Hi i am doing question 2

Answer 2

and i got f(x)=-1x + 0

Answer 3

no

Answer 4

No O:

Answer 5

is it f(x)=-0.5 + 0

Answer 6

as the line passes through the origin so you have one point (0,0) and other point (2,6)
now the slope from these points is
6/2 = 3
so the equation is
f(x) = 3x+0

Answer 7

Ok where break it down

Answer 8

so the Y- intercept witch is b is 0 right?

Answer 9

yes

Answer 10

Ok then whats the slope

Answer 11

its 3 as i told you

Answer 12

and how you got the slope

Answer 13

slope = m =(y2 - y1)/(x2 - x1)

Answer 14

how you got 2,6

Answer 15

from the graph

Answer 16

But the points on the graph where -6 and 6 it was dotted

Answer 17

you are talking about 1 or 2

Answer 18

question number 2

Answer 19

so if you look to the graph carefully what is the value of f(x) for x = 2
???

Answer 20

Huh you have to be little clearer

Answer 21

you have to be alittle detailed and pacific

Answer 22

and how you get 2

Answer 23

on x-axis you have certain numbers right???

Answer 24

Yeah the run go on

Answer 25

exactly

Answer 26

What about the run

Answer 27

now see the value of x = 2

Answer 28

I dont i see a line and dots on certains parts of the line

Answer 29

but i dont see how 2 is in it?

Answer 30

OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOHHHHHHHHHHHHHHHH

Answer 31

A light bulb just popped in meh head!

Answer 32

I get it cause you used rise over run so you did the doted one on the top so you ran to 2 on the x axis then you went up 6 rise! so thats how you got 6/2

Answer 33

Am i correct!

Answer 34

exactlyyyyyyyyyyyyyyyyyyyyyyy

Answer 35

Hehehe i feel smart ^-^

Answer 36

Hey can you stick with me on 1 more just incase so i can get a ahng of it

Answer 37

hang*

Answer 38

yes

Answer 39

Yay thanks

Answer 40

I am on question number 3

Answer 41

find the slope first

Answer 42

Yes it is 3

Answer 43

Graph pass through (4,20) and (3,0)
slope = 20 (use (y1-y2)/(x1-x2))
So y = 20 (x - 3)

Answer 44

(3,0) (4,20)

Answer 45

so i got right now f(x)=mx +3

Answer 46

so how do i know witch dot i suppose to follow the top or the buttom one

Answer 47

y-intercept is wrong @Need_Help_

Answer 48

Is the y intercept is 20

Answer 49

going up

Answer 50

its your free choice the slope will be same for any two points

Answer 51

I think is 60 for y-int

Answer 52

Ok so for now i am going to use the top so

Answer 53

no its not 20

Answer 54

its -60

Answer 55

so what is my y intercept so i can put it for b

Answer 56

and how you guys got -60

Answer 57

you have y = mx+b
put b = -60 in it you will get it

Answer 58

But how you guys got -60

Answer 59

Did you ran to 4 then rise to 20

Answer 60

ok from the start of this question you have to find the slope
slope = m = (20-0)/(4-3) = 20/1 = 20
now use point slope form to get the equation

Answer 61

Oh yeah -60.
∆y/∆x = slope = 20
y - y0 = m (x - x0)
y - 0 = 20 (x - 3)
y = 20x - 60 (QED)

Answer 62

ok give me a seocnd

Answer 63

we ran from 3 to 4 on horizontal and ran from 0 to 20 on vertical

Answer 64

i got 20/1

Answer 65

so thats right

Answer 66

ok hold on

Answer 67

so 20/1 is my slope right

Answer 68

yes

Answer 69

So do i plug it in my f(x)=mx + b now?

Answer 70

no

Answer 71

Ok i did the first step what do i do next then?

Answer 72

So what do i do with my 20/1

Answer 73

use point slope form now
consider any point in this graph say (3,0)
now you have one point (3,0) and slope = m =20
y-y1 = m(x-x1)

Answer 74

this is point slope form
y-y1 = m(x-x1)

Answer 75

where you get 3, 0

Answer 76

from the graph i got this point

Answer 77

is it the 3 on the graph that was dotted

Answer 78

for x = 3 y = 0
so the point is
(3,0)

Answer 79

yes yes

Answer 80

Ok so i got 20/1 and i got 3,0 so what do i do next

Answer 81

thus (x1,y1) = (3,0)
m = 0
use this now
this is point slope form
y-y1 = m(x-x1)

Answer 82

Uhh

Answer 83

So you want me to plug 3,0 zero in right

Answer 84

y-0 = 20(x-3)

Answer 85

got it??

Answer 86

Ok gewtting it

Answer 87

(x1,y1) = (3,0)
here
x1 =3 and y1 =0

Answer 88

ok

Answer 89

so your answer is ?????

Answer 90

y - 0 = 20x - 3

Answer 91

no no

also multiply this 20 with -3

Answer 92

oh the distrubtive property right right

Answer 93

yes

Answer 94

y-0=20x - 60

Answer 95

hmm thats right now
now right it in simple form