Question

What is the best way to classify each equation?
Column A Column B
1.

2.

3.

4.

A.
identity
B.
contradiction
C.
neither

Answer 1

1. http://static.k12.com/bank_packages/files/media/mathml_56e6af8e25c606dcc577d74d0c55491dd023247c_1.gif

2. http://static.k12.com/bank_packages/files/media/mathml_59e732620eccd4d781c66434c69af2cebda3780a_1.gif

3. http://static.k12.com/bank_packages/files/media/mathml_517fb34a1dea275598ef17f1ffae0e324d17ccc8_1.gif

4. http://static.k12.com/bank_packages/files/media/mathml_ade72b3e50d0cddf2bf115e4ac018df47737f9bc_1.gif

Answer 2

@AndrewTheCookie

Answer 3

@iPwnBunnies

Answer 4

I'll give medals please help

Answer 5

cookie you come to helkp xD

Answer 6

help?

Answer 7

I spy cx

Answer 8

explane how you got the answer's please

Answer 9

Im not answering right now

Answer 10

k

Answer 11

@Werewolfprincess

Answer 12

@mathstudent55

Answer 13

@Daniel_Chernioglo

Answer 14

@geerky42

Answer 15

You would just try and solve for x.

If you get x equal to one answer ( x=4 or something), then it is "neither"

If you end up with true equation ( 0=0 or something), then it's "identity."

Lastly if you end up with false equation ( 1=0 ), then it's "contradiction."

Answer 16

ya i need help solving some of them i don't need help with number 3 though

Answer 17

i need help with solving number 1 can you help me with that one please?

Answer 18

anyone?

Answer 19

@tejasvir

Answer 20

What did you get for number 1? What have you tried so far?

Answer 21

umm i did 22 - 3x + 7x = 4(x+5)
22 - 3x + 7x = 4x+20

Answer 22

and that's pretty much it

Answer 23

how would i solve 22- 3x + 7x

Answer 24

i think you would + 3x to 4x which would= 7x
so...22+7x=7x+20

Answer 25

then maybe subtract 7x from 7x→22=x+20

Answer 26

then - 20 from 22
2=x

Answer 27

lost

Answer 28

so that one would be neither?

Answer 29

Or try to combine like terms. \(-3x+7x \) is \(4x\)

So you have \(22+4x = 4x+20\)

Then subtract both sides by 4x.

\(22+4x \color{red}{-4x}= 4x\color{red}{-4x}+20\)

\(22=20\)

Answer 30

So that's contradiction.

Answer 31

how woulkd it be contradiction if its equal contradiction dosen't mean equal

Answer 32

identity means equal

Answer 33

No, identity means equation is true for any values of x.

\(2x = 2x\) is identity, because no matter what value you plug in for x, equation will always be true.

Contradiction means equation is false for any values of x.

Neither means equation is true for certain values of x.

Answer 34

Tell me, is \(22=20\) true or false?

Answer 35

oh

Answer 36

false

Answer 37

Right, so #1 is contradiction.

Answer 38

how?

Answer 39

22=20 is false.

Answer 40

where did you get 22 = 20 from?

Answer 41

Did you see my work above here?

Answer 42

i didn't understand it

Answer 43

Which part?

Answer 44

you put

Answer 45

-3x + 7x is 4x

Answer 46

Yeah, another way to see is that \(-3x+7x = x(-3+7)\), right?

And we know that \(-3+7\) is equal to \(4\), so \(-3x+7x = x(-3+7) = 4x\)

Answer 47

okay

Answer 48

What don't you understand?

Answer 49

okay now i get that back to the next thing you did

Answer 50

was that one like a example?

Answer 51

the one you just did

Answer 52

sorta, we were focus only on \(-3x+7x\) part.

So seeing equation as whole, we go

from \(22 - 3x + 7x = 4x+20\)

to \(22 +4x = 4x+20\)

Answer 53

Now we have 4x in both sides, right?

So we just cancel them out, and are left with \(22=20\)

Answer 54

k thanx i masted on the 5th one all i needed help was on the first one and your right its a contradiction xD BYEEE!

Answer 55

MEDAL FOR YOU!

Answer 56

Ok glad I helped