Question

Write an equation of the line that passes through (8,3) and (4,3)
y=3
y=4x+3
y=4
y=3x

Answer 1

First, find the slope. Do you know how to find the slope of two points?

Answer 2

no

Answer 3

To find the slope of two points, you do \[\frac{ y _{2}-y _{1} }{x _{2}-x _{1} }\]

Answer 4

ok

Answer 5

y2 is 3, y1 is 3, and x2 is 4, and x1 is 8

Answer 6

3-3
4-8?

Answer 7

yes, so that means the slope is 0/-4 which is 0.

Answer 8

now plug that into the point slope form equation which is
y-y1=m(x-x1)

Answer 9

where does division come from

Answer 10

very confusing

Answer 11

the reason you divide is because to find the slope, that is how you get it.
The explanation is long, but if you want it I can tell you

Answer 12

so its y=3?

Answer 13

Yes!

Answer 14

ok ty so much

Answer 15

Another way to solve this is looking at the two points, and seeing they both have the same y coordinate of 3. That means that y=3

Answer 16

can you help me with 1 more

Answer 17

sure

Answer 18

what does the slope for this relation represent
x(years since 1991) 2,5,7,7
y(book sales billions$) 18,21,23,25

Answer 19

its kind of like a little chart

Answer 20

Well, if the chart lines up so that 2 and 18 go together and 5 and 21 go together and so on, then it is just the points (2, 18) (5, 21) etc

Answer 21

ect?

Answer 22

it means and so forth

Answer 23

just wait, ill be back in like a minute

Answer 24

so thats the answer

Answer 25

2,18 5,21

Answer 26

ok

Answer 27

Im back

Answer 28

im guessing can my question a couple of seconds ago

Answer 29

read my*

Answer 30

still here?

Answer 31

did you get the last x coordinate wrong? should it be 8 or is it 7

Answer 32

its 8 oh

Answer 33

Is it possible to attach a picture of the question?

Answer 34

no but let me write it the best i can humanly do it

Answer 35

ok

Answer 36

X(Years Since 1991) 2,5,7,8
Y(Book Sales Billions$)18,21,23,24 What does the slope for this relation REPRESENT

Answer 37

Oh, you don't have to find the slope, you just need to know why it is important

Answer 38

if it says that 2 years after 1991 you sell 18 billion books and 5 years after 1991 you sell 21 billion books, what does that tell you

Answer 39

1991 to 1996 21 billoin books sold

Answer 40

Sort of,

Answer 41

i mean 3 billion from 1991 to 1996

Answer 42

it says that after 2 years you sell 18 billion and after 5 years you sell 21 billion, that means that the slope shows the increase or decrease in sales for those years

Answer 43

increase!!!!!!!

Answer 44

oh wait its a decrease

Answer 45

i think

Answer 46

No, actually it is a decrease because in two years you sell 18 billion, but then in the next 3 years, you only sell 3 billion. Then in the next 2 years you sell 2 billion and the next year you sell 1 billion

Answer 47

That means for the first you years, you sell 9 billion a year, but then after 8 years, you only sell 1 billion a year

Answer 48

*the first two years

Answer 49

so the relation represents a decrease or somthing

Answer 50

Yes, the slope shows the decrease in sales.

Answer 51

awsome stuff ty alot

Answer 52

yw