Question

Graph the function: y = 9 - 2x

Answer 1

Well, can you identify the y-intercept and the slope in this equation?

Answer 2

Also, welcome to OpenStudy! :)

Answer 3

are you there @Liv33 lol

Answer 4

I Believe it is, (2,5)

Answer 5

I don't really know where to start with the problem lol. I came here cause I wanted to understand it :)

Answer 6

@Liv33
Do you know how to put that equation into slope-intercept form? y=mx+ b form?

Answer 7

vaguely

Answer 8

y = 9 - 2x
In this case -2x is you mx
and 9 is your b
Now, can you place it in y=mx+b form for me?

Answer 9

yeah correct Karate an the answer is 2,5.

Answer 10

y = -2x +9

Answer 11

@JustinDrewBieber Liv is looking for a graph..I don't see where you are getting 2,5 from.

Answer 12

Good liv!
Now, y=mx+b is the slope-intercept formula in which m=slope (rise/run) and b= the y-intercept
So in this case, what is the y-intercept?

Answer 13

-2x + 9 ?

Answer 14

y=mx+b
y=-2x+9
We are asking what the y-intercept (b) is, try again. :)

Answer 15

9 ?

Answer 16

uh, 18

Answer 17

Correct liv.
@JustinDrewBieber Please do not interrupt the thread if you are not necessarily helping.

Answer 18

Right ok so if 9 is your y-intercept, how do you write that in coordinate form? (a,b)

Answer 19

Forgive My Mistakes Liv, I Was Confused. GoodLuck!

Answer 20

( ,9)

Answer 21

What would go in the space before the 9 lol

Answer 22

(-2, 9) ?

Answer 23

@karatechopper

Answer 24

Uhmm hm
Ok so for an intercept, these points are graphed on their respected axes.
So if asking for an x-intercept, you would say (x,0)
if asked for a y-intercept, you would say (0,y).
Make sense?

Answer 25

so (0, 9)

Answer 26

Correct.
Now, can you graph that for me?

Answer 27

Good. Ok now, a slope is something that we refer to as rise over run.
What is your slope (m) in
y=-2x+9

Answer 28

-2

Answer 29

Looks good. Now if rise over run is your slope. then we hav to put this in fraction form, you agree that -2= -2/1 correct?

Answer 30

Yes

Answer 31

Alright, So if slope is rise/run and we have -2/1, then We are essentially rising by -2 (but in this case you will be going down by 2 because it is a negative value), and going to the right (if run is positive) 1.
Do you understand that?

Answer 32

Yes, that makes sense

Answer 33

I you plot it you will have a graph like this.