Question

Can someone please show me how to graph this question? I tried but I got it half way wrong... I really need help please... Question~ Graph the following systems. Draw one line in yellow and one line in blue. Indicate the solution to the system ON the GRAPH. x - y = 0 3x + y = -4

Answer 1

what my teacher said about my graph~ "1st line graphed correctly; 2nd is not"

Answer 2

@alexandrea.lane do you think you could help me?

Answer 3

Yeah, give me a second

Answer 4

ok thank you very much

Answer 5

Hello, Abby, what happened to our dialogue? We were discussing this same question. Have you graphed y=x? Have you graphed y=-3x-4? Eventually y ou'll have to graph both and determine where the two lines intersect.

I will be getting off the 'Net now, but will return later.

Answer 6

I cant open your attachment

Answer 7

I closed the question (by accident) and you weren't replying to me so I figured you couldn't see it anymore... I'm sorry

Answer 8

@alexandrea.lane I can send a link to the graph... would you be ok with opening it that way?

Answer 9

Maybe. I'm on my school laptop so a lot of things are blocked by lets try it

Answer 10

ok, it's a long link

Answer 11

I've copied and pasted this into a new tap on my computer and it took me to the graph

Answer 12

Does your computer have snipping tool?

Answer 13

I'm not sure what that is... but maybe it does

Answer 14

What computer do you have?

Answer 15

a dell laptop

Answer 16

You want to go in the start menu and type in search bar "Snipping tool"

I cant open the link

Answer 17

ok then what?

Answer 18

You'll get a little box on your screen and a plus sign. Just copy the graph and save it

Answer 19

ok I did that

Answer 20

You saved it?

Answer 21

yes ma'am, do you want me to put it on here using the attach file ?

Answer 22

yeah

Answer 23

Can you see the graph now?

Answer 24

I can!

Answer 25

ok awesome

Answer 26

So you put both problems in slope form?

Answer 27

Yes ma'am I guess...

Answer 28

You guess??

Answer 29

well that's what I did and my teacher said "1st line graphed correctly; 2nd is not" so I'm not sure if I should have only done one or what

Answer 30

Okay what are your two equations

Answer 31

x - y = 0
3x + y = -4

Answer 32

you want the y by its self

Answer 33

yes ma'am

Answer 34

So your new equations would be?

Answer 35

3x+y=-4 is your second equation. Subtract 3x from both sides, thus isolating y on the left side.

Answer 36

x - y = 0 y=0?
3x + y = -4 = 4+3x+y=0?

Answer 37

Actually, abby, y=x in the first case, and in the second case we solve for y and obtain y=-3x-4.

Answer 38

As pointed out earlier by someone else, we want to isolate y on the left side and all the rest on the right side. That gives you y on the left side and -3x-4 on the right side.

The equation on the right side has a slope of what? y-intercept of what?

Answer 39

Abby, you posted a graph some time back and were correct:

mathgraph2.png

Why go through all this all over again?

How might others best help you at this point?

Answer 40

My teacher told me I got one line wrong...

Answer 41

Yes, you've mentioned that a couple of times.

y=x is straightforward; it goes through the origin (0,0) and has a slope of 1.
y=-3x=-4 is also a straight line, but it has a slope of negative 3 (m=-3) and a y-intercept of (0,-4). Are you able to plot such a line?

I think you should graph it by hand for the learning experience.

Answer 42

Look at y=-3x-4 again. IF x = 0, y = -3(0) - 4, or just -4. Thus, (0, -4) is a point on this line. Plot the point (0,-4) on the axes I've created for you just now.

Answer 43

Nice job. Now, you must find one additional point on the graph of y=-3x-4 For example, let x=-1 and find y; plot the resulting point, and then draw a line thru the 2 points.
Abby, I have to get off the 'Net but will be back after 7.