Question

Please help somebody! I promise I will MEDAL AND FAN! I really need help with coordinate. plane




Use integer values of x from -3 to 3 to graph the equation y = -2x^2 + 3

Please help.

Answer 1

Also y = 1/3 |x| -2

Answer 2

Please help someone

Answer 3

Alright. If we were to make this problem a bit simpler, and I asked you to plot points for the graph y=2x, would you know how to do that?

Answer 4

No

Answer 5

I don't understand how to graph an equation

Answer 6

Okay. Do you know what a function is?

Answer 7

yes

Answer 8

Okay. If I asked you to plot the point (2,3) would you know how to do that?

Answer 9

yes

Answer 10

Okay, this might be a bit of a jump. If x=1,2,3, how would you graph (x,2x)?

Answer 11

How do I plot 1,2,3 ?

Answer 12

I thought you could only plot 2 numbers

Answer 13

Remember, x can be any number right? So if I asked you to plot (x,2x) by plugging in those numbers, how would you do that?

Answer 14

Oh ok

Answer 15

Ooohhh so (1, 23) ?

Answer 16

Hmm, let's take this a step back. If I just asked you to solve
2x = ?

for x= 1, 2 and 3, would you be able to do that?

Answer 17

It's fine if that looks odd, I can rephrase it just let me know.

Answer 18

So if x = 1,2, and 3, do I multiply 2 by 1 , 2 , and 3, then add those answers together?

Answer 19

It's more like I'm asking you to do the same problem 3 times. Like, this is a multiple part problem if that makes sense

Answer 20

Im sorry if this is difficult I just suck at math.

Answer 21

ok

Answer 22

Like:

Solve x=1 for 2x =?

then

Solve x=2 for 2x=?

then

Solve x=3 for 2x=?

Answer 23

Ok so,

if x = 1, 2x = 2

if x = 2, 2x = 4

if x = 3, 2x = 6

right?

Answer 24

What do you think? :)

Answer 25

Yeah

Answer 26

Alright then, do you notice anything about those series of numbers?

Answer 27

You count by 2s every time

Answer 28

Well, if i re-word that, I would say you just add 2 each time

Answer 29

Right. That's interesting. Make a mental note of that, we'll come back to it later.

Answer 30

ok

Answer 31

I'm going to ask you to do the same thing for 3x=?

Can you solve for x=1, 2,3?

Answer 32

Ok.

x = 1, 3x = 3
x = 2, 3x = 6
x = 3, 3x = 9

Answer 33

Now do you notice anything about these numbers?

Answer 34

You add 3 every time

Answer 35

Yeah, that's right. I'm going to ask you to do the same problem one last time for

4x= ?

x=1,2,3

Answer 36

4, 8, 12

Answer 37

Perfect. Were you able to figure that out without manually plugging in the numbers?

Answer 38

Yes

Answer 39

You just add the number behind x by itself each time I guess

Answer 40

Alright then, awesome. So we could, theoretically, solve for any number with this method right, by just extending the pattern.

Now, before I asked you to solve the problem 3 times. I'm going to do the same thing here.

For x = 1, 2, 3

Find the coordinates (you'll have 3 coordinates) for (x,4x).

Answer 41

So (1, 4) (2, 8) and (3, 12)

Answer 42

Yes! Awesome job. Now, if I asked you to plot those all on a graph, what would it look like?

Answer 43

How do I draw that?

Answer 44

Hm, if I asked you to plot (1,2) on this plot:

Answer 45

I know how to plot it, but how do i show you?

Answer 46

Click the little pencil to reply using the drawing

Answer 47

And then just like, make a little dash wherever you think is correct. Or you can type in an X or whatever.

Answer 48

Its not formal or anything :P

Answer 49

Are you just having trouble because open study is finicky?

Answer 50

Hold on just a sec i will be RIGHT BACK i promise

Answer 51

Yeah no problem. Take your time. I may take a minute to respond when you do get back

Answer 52

@Hitaro9 Im here.

Answer 53

Hey

Answer 54

So, click the pencil on the graph a few replies up, and see if ya can plot (1,2), (2,4) (3,6)