Question

PLEASE HELP!!
What is the slope-intercept form of the function that contains the points (3, 1) and (2, 9)?
Y=__x+__

Answer 1

\[slope = \frac{ y2-y1 }{ x2-x1}\]

Answer 2

SO the slope is -8

Answer 3

y=mx+b slope = m

Answer 4

Yes

Answer 5

I know that I am just confused on how to get B

Answer 6

Ok...use the following\[(y-y1)=8(x-x1)\]

Answer 7

Let y1 be either one of the points on the line (3,1) or (2,9)

Answer 8

okay...I will try

Answer 9

Is it -24

Answer 10

Your answer needs to be something that looks like

y=mx+b

Use one of the ordered pairs and put them in this equation for x and y. Use the slope you found above for m. Now solve the equation for b.

Answer 11

Okay so the answer is y=-8+-24

Answer 12

\[(y-1) = -8(x-3)\]

Answer 13

ohhh

Answer 14

You still need to get the -1 off the left side of the equation

Answer 15

So add 1 to both sides and what do yu have?

Answer 16

I am lost i am so sorry

Answer 17

Sorry should be y-1= -8x +24 now add 1 to both sides

Answer 18

Ok we know the slope is -8 correct.

Answer 19

Right

Answer 20

The formula for the line is (y-y1) = m(x-x1) with m being the slope.

Answer 21

So we have (y-y1) = -8 ( x-x1)

Answer 22

You see this?

Answer 23

Yes

Answer 24

OK now we have (y-y1)= -8 (x-x1). You now plug in the values from the points on the line for x1 and y1. I will use the point (3,1).

So it will look like this (y-1) = -8(x-3)
Still with me?

Answer 25

Yes i understand

Answer 26

Great now you need to distribute the right side of the equation to get (you did this earlier)

now we have
y-1 = -8x+24

Still OK with everything?

Answer 27

Yeah I am okay

Answer 28

The formula is y=mx+b....we have y-1 = -8x+24..so we have to get rid of the -1 on the left side of the equation. To do that you will add 1 to both sides of the equation and what do you end up with?

Answer 29

You end up with y=-9x+24

Answer 30

No you cannot add 1 to 8x you add it to 24

Answer 31

okay sorry

Answer 32

So it would be y=-8+-25

Answer 33

yes

Answer 34

then you divide both sides right

Answer 35

No the answer is y=-8x+25

Answer 36

okay THANK YOU SO MUCH

Answer 37

YW