Question

Please help me. How do I graph this equation and find 3 plots? -2y = -x + 8

Answer 1

Do yew have a graphing calculator?

Answer 2

No

Answer 3

You need to isolate your y variable, that will be a good start

Answer 4

-2y = -x + 8 .... what do you need to do to the y side of the equation to get rid of the -2?

Answer 5

divide? or add?

Answer 6

you tell me. Currently y is being multiplied by -2, correct?

Answer 7

yes

Answer 8

so what would be something you could do to eliminate that?

Answer 9

add 2

Answer 10

okay let's try adding 2. Remeber, what we do to one side we must also do to the other to keep it equal. So if we add 2, we end up with -2y + 2 = -x + 10

Answer 11

This did not get y alone. Let's try something else.

Answer 12

okay divide by 2?

Answer 13

very close! Do you see the issue?

Answer 14

the y is still a negative?

Answer 15

yes! what can we do about that?

Answer 16

should we have divided by a negative 2?

Answer 17

correct! can you write me the correct equation then before we move on to graphing?

Answer 18

Yes I think I see what you meant :) can you simplify it now?

Answer 19

im not sure how to do the other side of y :/

Answer 20

or i mean y = 2 + -4

Answer 21

good your first one was correct, you should have

Answer 22

oh okay.

Answer 23

Now, dividing by (-2) is the same thing as doing what?

Answer 24

im not sure ...

Answer 25

im sorry i dont know why im not just getting this

Answer 26

yes! i do

Answer 27

good! so now we have it in slope-intercept form, y=mx + b...
which is y = (slope)x + y-intercept

Can you identify for me where your graph will cross the y-axis? at y=?

Answer 28

It will cross the y-axis at b, so what is the b in your equation?

Answer 29

4

Answer 30

good... and what is x equal to at the y-axis?

Answer 31

once you have a few points plotted, since it is a linear equation you can just lay a ruler across the points to extend the graph beyond the points you have specifically calculated

Answer 32

well i am doing this on an online graph. i don't understand how much i am supposed to go up for the last two plots

Answer 33

thank you for being patient with me

Answer 34

Did you do that table I sent you? Because those are the points to plot... the y values are how high you go vertically and the x values are how far out you go horizontally

Answer 35

Just to note -- I don't think we finished working the negative through up there. Final equation should be y=(1/2)x-4, because as you recall, we divided by (-2)