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math people: for this problem...........?
2x - 2 = 4x + 8
do u add 2x or subtract 4x to start with??? or neither. its not like i understand this lol
5 Answers
- 8 years agoFavorite Answer
You could actually add 2x or subtract 4x first as it wouldn't really make a difference.
To solve the equation:
2x-2 = 4x+8
------ -------
Add 2 to both sides!
2x = 4x+10
---- --------
Subtract 4x from both sides!
-2x = 10
---- ----
Divide by -2 from both sides!
The final answer would be: x = -5
There you go!^^
Just to make sure, plug in -5 as the x-value in order to check yourself. If both sides equal the other, then the answer is correct!
STUDY HARD!(:
- JaredLv 78 years ago
Try it:
add 2x to both sides:
2x - 2 + 2x = 4x + 8 + 2x
--> collect like terms, now you have
4x - 2 = 6x + 8 <-- you haven't gotten anywhere...
...try subtracting 4x from both sides
2x - 2 - 4x = 4x + 8 - 4x
--> now the 4x's cancel on the right, leaving
-2x - 2 = 8
--> now just solve for x...add 2 to both sides:
-2x - 2 + 2 = 8 + 2
--> -2 + 2 = 0...-2x + 0 = -2x
-2x = 10
--> now divide by -2
-2x/-2 = 10/-2
--> on the left, the -2's cancel, leaving only x
x = -5
...or you could have subtracted 2x from both sides:
2x - 2 - 2x = 4x + 8 - 2x
-->
-2 = 2x + 8
--> subtract 8
-2 - 8 = 2x + 8 - 8 --> -10 = 2x
--> divide by 2
-10/2 = 2x/2 --> 2's cancel, again, leaving x = -10/2 = -5 <-- same as what we got the "other" way.
- Iggy RockoLv 78 years ago
2x - 2 = 4x + 8
2x - 2x - 2 = 4x - 2x + 8
-2 = 2x + 8
-2 - 8 = 2x + 8 - 8
-10 = 2x
-10/2 = 2x/2
-5 = x
- 8 years ago
You can do either way. It won't change your answer. I would suggest subtracting 2x first, to avoid working with negatives. You can do this first or add 2 first, it doesn't matter. If you wanted you could subtract 4x or subtract 8, but this way is slightly easier.
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- 8 years ago
Just group the similar terms in one side of the equation. When you take a term to the other side of the equality, the sign changes.
-2-8=4x-2x
rearranging.
2x=-10
x=-5