Question

solve equation by graphing y=-x-8 9x-8y=-21 please someone help me step by step so i can learn to do this on my own

Answer 1

do you have graph paper?

Answer 2

yes

Answer 3

then establish a horizontal line and call it X; draw a vertical line and call it Y

Answer 4

did that

Answer 5

where the 2 lines cross, call it (0,0) and we can then plot other points from that origin.

Answer 6

get 2 different colored crayons , one for each line that we are going to plot...

Answer 7

i have numbered graph paper

Answer 8

k

Answer 9

numbered what???....... thats just cheating ;)

y=-x-8 since this is an equation for a line, we only need 2 points to draw a line with right?

Answer 10

what, no my graph paper is pre-numbered y,x 10,-10

Answer 11

back in my day we had to work to get numbers on graph paper lol

Answer 12

yeah i was doing that way till i found it online and printed a bunch

Answer 13

online???...... oh well :)

So lets plot 2 points for this y=-x-8 equation. What are your 2 favorite numbers for an x ?

Answer 14

any #'s?

Answer 15

any number between -10 and 10 would be helpful :)

Answer 16

5, -3

Answer 17

he easy form is must include :

-name of a drug
-history of drug
-street name
-short +long term effect
-how is it ingested
-what effects does it have on body
-anyother intersting facts


amisstro plz help me write an essay

Answer 18

ok...les start with ....... -3.

when x = -3 our equation becomes:

y=-x-8

y=-(-3)-8

y = 3-8

y = -5

Answer 19

i dont do essays very well...srry

Answer 20

with this bounty of knowledge we have just obtained we can use it to make a point on the graph.

Answer 21

put your crayon on the x = -3 part of the X axis

Answer 22

Is Mary still there?

Answer 23

(-3,-5)

Answer 24

yeah

Answer 25

Okay, The drug Lisinopril is used for high blood pressure.

Answer 26

yes, we put a point at (-3,-5)

Answer 27

if yall can take this discussion to another post, that would be helpful :)

Answer 28

yes please

Answer 29

sure

Answer 30

write it in paragraphas

Answer 31

Now we can use x = 5 and see what we get.

y=-x-8

y=-(5)-8

y = -13 (5,-13) gonna have to get longer graph paper for that one ;)

Answer 32

can we go to the english section and help me i posted there

Answer 33

graphed

Answer 34

now we use the other equation, in a different color, and graph its line..

Answer 35

can we go to the english section and help me i posted there

Answer 36

9x-8y=-21 , the easiest numbers to use are 0 right?

Answer 37

right

Answer 38

ok lets use x = 0 and find a value for y.

9(0)-8y=-21

-8y = -21

y = 21/8 (0,21/8)

Answer 39

21/8 = 2' 5/8

Answer 40

amistre64

the essay form is must include :

-name of a drug
-history of drug
-street name
-short +long term effect
-how is it ingested
-what effects does it have on body
-anyother intersting facts

Answer 41

when y = 0 x = what?

9x-8(0)=-21

9x = -21

x = -21/9 (-21/9 , 0)


-21/9 = -2' 3/9 = -2' 1/3

Answer 42

can we go to the english section and help me i posted there

Answer 43

mary: I dont write essays :) please take it to another post.

Answer 44

hold on i got lost, im really bad at math

Answer 45

tell me where we got lost :)

Answer 46

21/8=2 5/8

Answer 47

what would my point be for that

Answer 48

(x=0, y= 2' 5/8) that 'mark helps to define the integer from the fraction

Answer 49

go up 2 and then mark just a liitle above halfway

Answer 50

so to graph it (0,2'5/8)

Answer 51

that would pe one point on the graph of a new line equation.... different colors right?

Answer 52

right

Answer 53

the second point is on the x aixs because we made y = 0 right?

Answer 54

(-2' 1/3 , 0) is our other point, not connect these points with a line

Answer 55

not means now.... typos persist

Answer 56

on my paper it asks what is the solution of the equation x=? y=?

Answer 57

sry solution of the system of equations

Answer 58

where the lines that we graph cross, where they meet up is a single point. It is asking for the point where the 2 lines meet.

Answer 59

by my graphing they dont

Answer 60

we started by finding 2 points for the line to travel thru, but the ends never quit, they go on and on and on.... these lines meet at one point, and that point is our solution.

Did you extend your lines until they meet at that point? or did you just connect from dot to dot?

Answer 61

wait i didnt draw the lines all the way thru

Answer 62

is it (-5,-2)

Answer 63

(-5,-3)

Answer 64

Dunno, you graphed it ;) but lets put those numbers in our equations and see how good they are...

y=-x-8
-2 = --5-8
-2 = 5-8
-2 = -3 ..... its a false statment, but we know its close :)

9x-8y=-21
9(-5)-8(-2)=-21
-45 + 16 = -21
-29 = -21 .... wanna try that -3 instead?

Answer 65

need a ruler, using a folded piece of paper

Answer 66

the solution by graphing is just a technique, after you use it to "see" what is going on for a solution, you will never really use it again unless you need a visual.

Answer 67

how often are u on here i need a ft tutor

Answer 68

as long as the library is open and I dont have class :) ....alot ;)

Answer 69

ok well i go to strayer university i am always on line, and like i said i really really suck at this kind of math so i always need help
got to go for now but will be back on later up until about 3am nc time

Answer 70

nc ...im in florida :) might be here between 9 and 2

Answer 71

morning i assume?

Answer 72

same time zone,

Answer 73

yep, same zone, college library closes at 2am... I should be around here somewhere. Im the guy with all the fans lol

Answer 74

yes u r we could exchange numbers if you want that way hearing it sometimes makes better sense

Answer 75

id rather keep it online ;) you can emailme at tony031172@gmail.com if you need to get in touch with me.

Answer 76

ok great aatinabo@yahoo