anonymous
  • anonymous
i need help solving this system by graphing??..
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
\[\left\{ 2x+y=-7 \right\} \]
anonymous
  • anonymous
y=2x-7
anonymous
  • anonymous
\[\left\{ -3x+2y=14 \right\}\]

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anonymous
  • anonymous
{−3x+2y=14} -2y -2y -3x=12 /-3 /-3 x=-4
anonymous
  • anonymous
\[\{\begin{matrix}2x + y = -7 \\ -3x+2y = 14\end{matrix}\}\]
anonymous
  • anonymous
ok i got through the first step
anonymous
  • anonymous
To solve by graphing, rewrite them in the standard y=mx + b form and graph each one. Then find where they cross.
anonymous
  • anonymous
wait, im confused??
anonymous
  • anonymous
2x+y=−7} in y=mx+b for its like this y=2x-7
anonymous
  • anonymous
i plug in the other equation into y=mx+b
anonymous
  • anonymous
If you are asked to solve by graphing you have to write the equations in standard form and graph them.
anonymous
  • anonymous
yess
anonymous
  • anonymous
yes
anonymous
  • anonymous
so now i jst do this
anonymous
  • anonymous
y=2(-4)-7
anonymous
  • anonymous
y=-8-7
anonymous
  • anonymous
\[2x + y = -7 \implies y = -2x + -7\] So draw that line on some graph paper. \[-3x+ 2y = 14 \implies y = \frac{3}{2}x + 7\]
anonymous
  • anonymous
???
anonymous
  • anonymous
You don't do any algebra when you solve by graphing.
anonymous
  • anonymous
then hyou make a table of values then you get your coordinates and graph them on the graph and when it makes a straight line you draw it throughth and make sure you xtende the line
anonymous
  • anonymous
(Other than the algebra to get the equation into standard form)
anonymous
  • anonymous
wait so how do i get the corrdinates?
anonymous
  • anonymous
by using numbers for x and psubititing it to the equation and you get you x and y then you graph them
anonymous
  • anonymous
yes i already have some graphed because i have a multiple choice.
anonymous
  • anonymous
ok
anonymous
  • anonymous
if you needl help ask me
anonymous
  • anonymous
yes i do
anonymous
  • anonymous
ok
anonymous
  • anonymous
i dnt noe how to get the y value?
anonymous
  • anonymous
ok what is your first eqution
anonymous
  • anonymous
do i jst plug it into the equation
anonymous
  • anonymous
whats the equation
anonymous
  • anonymous
2x+y=-7
anonymous
  • anonymous
Just plot 2 points and draw a straight line that goes through each of them.
anonymous
  • anonymous
Set x=0 for the first point and figure out what y is. Then set y = 0 for the second point and find what x is.
anonymous
  • anonymous
polpak i tryed that its doesnt help
anonymous
  • anonymous
either way i dnt need to graph them they r alrdy graphed
anonymous
  • anonymous
ok good
anonymous
  • anonymous
Oh, then just check to see which ones go through the points you plot.
anonymous
  • anonymous
ok i will check.
anonymous
  • anonymous
but do you get how to get x an y
anonymous
  • anonymous
no i dnt
anonymous
  • anonymous
yoplak you mean at which oints do they intersect
anonymous
  • anonymous
i tried to check on the graph and didnt understand
anonymous
  • anonymous
so ok diid you changed the equation they give you to y=mx+b form
anonymous
  • anonymous
yes
anonymous
  • anonymous
y=2x-7
anonymous
  • anonymous
what are the equations that you changed
anonymous
  • anonymous
the top one which is 2x+y=-7
anonymous
  • anonymous
ok
anonymous
  • anonymous
so do i jst plug in the x value that i got
anonymous
  • anonymous
which was -4?
anonymous
  • anonymous
can you attach this work and give me the linnk
anonymous
  • anonymous
how?
anonymous
  • anonymous
what numbers diid you use for x
anonymous
  • anonymous
ask one of your parents
anonymous
  • anonymous
ohh the choices u mean??
anonymous
  • anonymous
ok
anonymous
  • anonymous
a.(-4,-1) b.(-4,1) c.(4,1) d.(4,-1)
anonymous
  • anonymous
i think its either a or b.
anonymous
  • anonymous
wht is the questiom
anonymous
  • anonymous
solve the system by graphing
anonymous
  • anonymous
ok diid you grpah the equatios
anonymous
  • anonymous
noo they r alrdy graphed they r the choices too withthe x and y values
anonymous
  • anonymous
what doe the graph show does it show 2 lines crossing each other
anonymous
  • anonymous
yes
anonymous
  • anonymous
at what point do they intersect
anonymous
  • anonymous
in other words cross at which 2 points
anonymous
  • anonymous
which one??
anonymous
  • anonymous
a is 0 n 6 i think
anonymous
  • anonymous
both of the lines
anonymous
  • anonymous
how do i knoe they r like in the middle of 2 #s?
anonymous
  • anonymous
can you make an attachmen t to this work so i can see this
anonymous
  • anonymous
ask your mom or dad
anonymous
  • anonymous
so i can help you better and faster
anonymous
  • anonymous
i wuld have to scan it to the comp.
anonymous
  • anonymous
yes
anonymous
  • anonymous
ill see wait a lil
anonymous
  • anonymous
ok
anonymous
  • anonymous
u there
anonymous
  • anonymous
yes
anonymous
  • anonymous
diid you scan it
anonymous
  • anonymous
im doing it rite now
anonymous
  • anonymous
ok
anonymous
  • anonymous
what grade you in
anonymous
  • anonymous
8th and u??
anonymous
  • anonymous
me too
anonymous
  • anonymous
ohh
anonymous
  • anonymous
am good at math i diid this already
anonymous
  • anonymous
i knew it your were in 8th
anonymous
  • anonymous
ohh im not so good
anonymous
  • anonymous
are you finsih scaning
anonymous
  • anonymous
ok its saving
anonymous
  • anonymous
ok give me the link
anonymous
  • anonymous
i cant find it
anonymous
  • anonymous
wait a lil plz
anonymous
  • anonymous
ok
anonymous
  • anonymous
ohh it look all weird
anonymous
  • anonymous
how
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
let me scan it again
anonymous
  • anonymous
you made it uupside down
anonymous
  • anonymous
yea i noe im scanning it again.
anonymous
  • anonymous
ok how many questions you have got i can help you
anonymous
  • anonymous
quite a feww.
anonymous
  • anonymous
ok am happy to help
anonymous
  • anonymous
are you doing scanning
anonymous
  • anonymous
yes
anonymous
  • anonymous
ok
anonymous
  • anonymous
plz give me the link
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
ohh sry i gave u the wrong one
anonymous
  • anonymous
ok it wont open though
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
ohh that was the other side let me do it one more time srry.
anonymous
  • anonymous
make it clear becuse it hard to understand the questions
anonymous
  • anonymous
anonymous
  • anonymous
i cant see th egprah for question 3 it confusing its dark
anonymous
  • anonymous
i noe thats the best ican get it too
anonymous
  • anonymous
ok so why are the graphs colored
anonymous
  • anonymous
idkk
anonymous
  • anonymous
because on my paper they r shaded with like gray n black
anonymous
  • anonymous
why though
anonymous
  • anonymous
because thats how they r
anonymous
  • anonymous
heyy r u still there??
anonymous
  • anonymous
yes
anonymous
  • anonymous
ok
anonymous
  • anonymous
whicc question you working on
anonymous
  • anonymous
4.
anonymous
  • anonymous
its a -4,-1
anonymous
  • anonymous
how do u noe?
anonymous
  • anonymous
jst tell me how u got -1?
anonymous
  • anonymous
ok if you plugg -4 for bopth equations for x you r x will be -4 and y -1 for both equations
anonymous
  • anonymous
i pluged it in and got this
anonymous
  • anonymous
y=2(-4)-7
anonymous
  • anonymous
y=-8-7
anonymous
  • anonymous
which equals 15 ???
anonymous
  • anonymous
???
anonymous
  • anonymous
heyy
anonymous
  • anonymous
r u still there???
anonymous
  • anonymous
hey
anonymous
  • anonymous
yeah

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