Question

Create a graph and a table to solve the system. Check your answer. Enter your answer as the following example: (5, -6)

x+y=2
x-y=4

Answer 1

easier to add them up and get
\[2x=6\] then sole for \(x\)

Answer 2

*solve

Answer 3

x is 3 ?

Answer 4

a graph is a long and time consuming way to solve this, but it will work
yes \(x=3\)

http://www.wolframalpha.com/input/?i=x%2By%3D2%2Cx-y%3D4

Answer 5

and since \(x=3\) and \(x+y=2\) you have \(3+y=2\) and you can solve for \(y\)

Answer 6

is y 5

Answer 7

no

Answer 8

im so bad in alg 2 :(

Answer 9

\[3+y=2\] subtract \(3\) from both sides to get \(y\)

Answer 10

i think you added 3
but you need to subtract 3
a little practice is all you need, it is not like you are born knowing this

Answer 11

Oh yeah i know how to do that, i was good ion alg 1 & geometry when i was in public school

Answer 12

so y is -1

Answer 13

yes, \(y=-1\)

Answer 14

you can check that this is right, because \[3-1=2\\3+1=4\]

Answer 15

ok i got you, & so i write the answer like this? (3,-1)

Answer 16

yes

Answer 17

Awesome! Thank you :)

Answer 18

yw

Answer 19

I got it wrong!?

Answer 20

no, it is right,
the solution is \((3,-1)\)

Answer 21

It told me it was wrong..

Answer 22

wait i typed it on the wrong one :(

Answer 23

lol

Answer 24

damn on line systems all ways messing with you

Answer 25

I know! If i wouldnt have done that i woulda passed that damn quiz!

Answer 26

what? you have to do it again??

Answer 27

Yea i gotta retake it, im doing online school :/

Answer 28

ick

Answer 29

good luck

Answer 30

Use a graph and a table to solve each system. Check your answer.
y+x=5
3x-5y=-1

Answer 31

can u explain step by step how to do these?

Answer 32

do you have to use a graph? or can we just solve it?

Answer 33

it would be much easier and quicker to solve using algebra rather than a graph

Answer 34

yea we can just sole its multi choice
no graph stuff

Answer 35

ok then lets knock it out

Answer 36

\[y+x=5\\ 3x-5y=-1\] first equation is the same as \(y=5-x\) so we can replace the \(y\) in the second equation by \(5-x\) with careful use a parentheses and get
\[3x-5(5-x)=-1\]

Answer 37

this has only one variable, so we can solve for \(x\) via
\[3x-5(5-x)=-1\\
3x-25+5x=-1\\
8x-25=-1\]

Answer 38

now add \(25\) to both sides and get
\[8x=24\] and solve for \(x\) by dividing by \(8\) to get
\(x=3\)

Answer 39

now since \(x=3\) and \(x+y=5\) we get \(3+y=5\) making \(y=2\) and the solution is \((3,2)\)

Answer 40

more or less clear?

Answer 41

still so confusing but i can use that as a guide! Thank you

Answer 42

yw

Answer 43

Do you know this? I have got it wrong 2 times already!

Classify the system and determine the number of solutions.
Check all that apply.
7x + y = 13
28x + 4y = -12

infinitely many solutions
inconsistent
consistent
no solution

Answer 44

this is NO Solution for this
also known as "inconsistent"

Answer 45

i think you are supposed to select them both

Answer 46

\[7x + y = 13 \\28x + 4y = -12\]if yo multiply the first equation by \(4\) you get
\[28x + 4y = 52\\ 28x + 4y = -12\] and there is no way to make \(52=-12\)

Answer 47

what about this one??
Classify the system and determine the number of solutions. (Check all that apply.)
$7x - y = -11$
$3y = 21x + 33$

dependent
inconsistent
infinitely many solutions
no solution
consistent
independent

Answer 48

what's with the dollar signs?

Answer 49

Oh it just put that in there ignore those, i just copied it from my page

Answer 50

ok well they are the same line, so one answer is "infinitely many solutions"
also i believe this can be called "consistent"

Answer 51

oh, also add "dependent"

Answer 52

Thank you so so much!!!

Answer 53

yw

Answer 54

did you pass the quiz?

Answer 55

im trying to do these last 2 by going with what u explained im so freaking lost!

Answer 56

i will help you if you like

Answer 57

Use a graph and a table to solve the system. Check your answer. Enter your answer as the following example: (5, -6)
x - y = -1
4x - 2y = 2

Answer 58

See i had a baby and thats the only reason im finishing my senior year online. & its so hard with the math, i got behind so i hvae 3 units to do by the 9th!

Answer 59

\[x - y = -1 \\4x - 2y = 2\] multiply the first equation by \(-2\) and get
\[-2x+2y=2\\
4x-2y=2\]

Answer 60

now add them up and get \(2x=4\) and so \(x=2\)

Answer 61

since \(x=2\) and \(x-y=-1\) you have \(2-y=-1\) making \(y=3\) and the solution is \((2,3)\)
how old is your baby?

Answer 62

That was much easier to understand, now i just gotta get it to stick with me, & he will be 7 months on the 6th

Answer 63

must keep you pretty busy i am sure
hard to do math, on line or otherwise

Answer 64

you done?

Answer 65

Yes i passed that time!!

Answer 66

whew!!

Answer 67

good luck with the rest of the class

Answer 68

Thank you!

Answer 69

yw