anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
do you have graph paper?
anonymous
  • anonymous
yes
amistre64
  • amistre64
then establish a horizontal line and call it X; draw a vertical line and call it Y

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anonymous
  • anonymous
did that
amistre64
  • amistre64
where the 2 lines cross, call it (0,0) and we can then plot other points from that origin.
amistre64
  • amistre64
get 2 different colored crayons , one for each line that we are going to plot...
anonymous
  • anonymous
i have numbered graph paper
anonymous
  • anonymous
k
amistre64
  • amistre64
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?
anonymous
  • anonymous
what, no my graph paper is pre-numbered y,x 10,-10
amistre64
  • amistre64
back in my day we had to work to get numbers on graph paper lol
anonymous
  • anonymous
yeah i was doing that way till i found it online and printed a bunch
amistre64
  • amistre64
online???...... oh well :) So lets plot 2 points for this y=-x-8 equation. What are your 2 favorite numbers for an x ?
anonymous
  • anonymous
any #'s?
amistre64
  • amistre64
any number between -10 and 10 would be helpful :)
anonymous
  • anonymous
5, -3
anonymous
  • anonymous
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
amistre64
  • amistre64
ok...les start with ....... -3. when x = -3 our equation becomes: y=-x-8 y=-(-3)-8 y = 3-8 y = -5
amistre64
  • amistre64
i dont do essays very well...srry
amistre64
  • amistre64
with this bounty of knowledge we have just obtained we can use it to make a point on the graph.
amistre64
  • amistre64
put your crayon on the x = -3 part of the X axis
anonymous
  • anonymous
Is Mary still there?
anonymous
  • anonymous
(-3,-5)
anonymous
  • anonymous
yeah
anonymous
  • anonymous
Okay, The drug Lisinopril is used for high blood pressure.
amistre64
  • amistre64
yes, we put a point at (-3,-5)
amistre64
  • amistre64
if yall can take this discussion to another post, that would be helpful :)
anonymous
  • anonymous
yes please
anonymous
  • anonymous
sure
anonymous
  • anonymous
write it in paragraphas
amistre64
  • amistre64
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 ;)
anonymous
  • anonymous
can we go to the english section and help me i posted there
anonymous
  • anonymous
graphed
amistre64
  • amistre64
now we use the other equation, in a different color, and graph its line..
anonymous
  • anonymous
can we go to the english section and help me i posted there
amistre64
  • amistre64
9x-8y=-21 , the easiest numbers to use are 0 right?
anonymous
  • anonymous
right
amistre64
  • amistre64
ok lets use x = 0 and find a value for y. 9(0)-8y=-21 -8y = -21 y = 21/8 (0,21/8)
amistre64
  • amistre64
21/8 = 2' 5/8
anonymous
  • anonymous
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
amistre64
  • amistre64
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
anonymous
  • anonymous
can we go to the english section and help me i posted there
amistre64
  • amistre64
mary: I dont write essays :) please take it to another post.
anonymous
  • anonymous
hold on i got lost, im really bad at math
amistre64
  • amistre64
tell me where we got lost :)
anonymous
  • anonymous
21/8=2 5/8
anonymous
  • anonymous
what would my point be for that
amistre64
  • amistre64
(x=0, y= 2' 5/8) that 'mark helps to define the integer from the fraction
amistre64
  • amistre64
go up 2 and then mark just a liitle above halfway
anonymous
  • anonymous
so to graph it (0,2'5/8)
amistre64
  • amistre64
that would pe one point on the graph of a new line equation.... different colors right?
anonymous
  • anonymous
right
amistre64
  • amistre64
the second point is on the x aixs because we made y = 0 right?
amistre64
  • amistre64
(-2' 1/3 , 0) is our other point, not connect these points with a line
amistre64
  • amistre64
not means now.... typos persist
anonymous
  • anonymous
on my paper it asks what is the solution of the equation x=? y=?
anonymous
  • anonymous
sry solution of the system of equations
amistre64
  • amistre64
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.
anonymous
  • anonymous
by my graphing they dont
amistre64
  • amistre64
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?
anonymous
  • anonymous
wait i didnt draw the lines all the way thru
anonymous
  • anonymous
is it (-5,-2)
anonymous
  • anonymous
(-5,-3)
amistre64
  • amistre64
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?
anonymous
  • anonymous
need a ruler, using a folded piece of paper
amistre64
  • amistre64
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.
anonymous
  • anonymous
how often are u on here i need a ft tutor
amistre64
  • amistre64
as long as the library is open and I dont have class :) ....alot ;)
anonymous
  • anonymous
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
amistre64
  • amistre64
nc ...im in florida :) might be here between 9 and 2
anonymous
  • anonymous
morning i assume?
anonymous
  • anonymous
same time zone,
amistre64
  • amistre64
yep, same zone, college library closes at 2am... I should be around here somewhere. Im the guy with all the fans lol
anonymous
  • anonymous
yes u r we could exchange numbers if you want that way hearing it sometimes makes better sense
amistre64
  • amistre64
id rather keep it online ;) you can emailme at tony031172@gmail.com if you need to get in touch with me.
anonymous
  • anonymous
ok great aatinabo@yahoo

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