will medal
what is the best way to classify each question?
A) Identity
B) Contradiction
C) Neither

- M_M13

will medal
what is the best way to classify each question?
A) Identity
B) Contradiction
C) Neither

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- M_M13

1. 5X - 20 = 2(3X - 10)
2. 4X - 16 - 2X = 2(X-8)

- M_M13

3. 6X - 15 = 3(2x - 6)
4. 5X -3(X -4) = 2(X - 6)

- anonymous

Do you know what identits and contradictions are in mathematic terms?

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## More answers

- kweenlexis

0.0
lets see

- M_M13

help?

- anonymous

An identity is when the equation is true, such as 3 = 1 + 2. A contradiction is when the equation is not true, such as 3 = 4 x 1. If you simplify the equations given, you should be able to solve whether or not they are identities or contradictions

- M_M13

@kweenlexis help?

- M_M13

help simplify

- anonymous

1. 5X - 20 = 2(3X - 10)
If we simplify the second half, we will be able to solve the problem. The only step we need to do with this one is distribute, so we just multiply that which is in the parenthesis by the number outside, in this case 2.
1. 5x - 20 = 6x - 20
is the simplified version for the first problem

- M_M13

ok...

- anonymous

As we can see, 5x - 20 does not equal 6x - 20, so that would be a contradiction

- M_M13

ok

- anonymous

2. 4X - 16 - 2X = 2(X-8)
4x and -2x are like terms, so we can combine them together to create 2x.
2. 2x - 16 = 2(x - 8)
when we use the distributive property, we can simplify the second half to
2. 2x - 16 = 2x - 16
So is this an identity or a contradiction

- kweenlexis

oh my bad i was doing some thing :(

- M_M13

its ok

- M_M13

so 2. is a contradiction

- M_M13

cause the sides are the same yet they're opposite

- M_M13

wait is 2. identity

- anonymous

Yes, 2. is an identity. Are you starting to get the hang of it?

- M_M13

ya, I just saw the question wrong

- M_M13

can you help me with the others?

- anonymous

sure

- M_M13

thanks i'll give you a medal after

- M_M13

hi

- M_M13

hello?

- anonymous

3. 6X - 15 = 3(2x - 6)
this is just a one step distributive, so the second half will be
6x - 15 = 6x - 18
Identity or contradiction?
4. 5X -3(X -4) = 2(X - 6)
This one is more complicated, as there are parentheses on both sides. We just need to tackle them one at a time.
The first half will come out as 5x - 3x - 12, and then we can combine the like terms (5x and 3x) so that the first half will be 2x - 12
The second half is just distribution, so 2x - 12.
The equation ends up simplifying to 2x - 12 = 2x - 12
Identity or contradiction?
Hope I helped!

- M_M13

3. is Identity

- M_M13

sorry I meant for 4

- M_M13

4. is identity and 3. is...

- M_M13

3. is contradiction or neither?

- anonymous

3. is a contradiction.
Good job!

- M_M13

thank you

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