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Posted by **carolina** on Tuesday, August 28, 2007 at 6:47pm.

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X+(-9)=-5

- algebra -
**Ms. Sue**, Tuesday, August 28, 2007 at 6:49pmx + (-9) = -5

x = -5 + 9

x = 4

- algebra -
**carolina**, Tuesday, August 28, 2007 at 6:50pmbut why does X = -5 +9

- algebra -
**Count Iblis**, Tuesday, August 28, 2007 at 6:55pmIf A = B, then that implies that:

A + a = B + a

for any number a.

So, if

X + (-9) = -5

then choosing a = 9 we get:

X + (-9) + 9 = -5 + 9

Since (-9) + 9 = 0 we have

X = -5 + 9

- algebra -
- algebra -
**Ms. Sue**, Tuesday, August 28, 2007 at 6:54pmYou need to get the unknown on one side of the equation and the knowns on the other side. To do that you subtract -9 from the left side, change the sign and add it to the right side.

- algebra -
**carolina**, Tuesday, August 28, 2007 at 7:29pmi still dont get it

- algebra -
- algebra -
**carolina**, Tuesday, August 28, 2007 at 7:24pmii still dont get it

- algebra -
**DrBob222**, Tuesday, August 28, 2007 at 7:48pm**Let's try this.**

X+(-9)=-5

**Remember, you can do anything to an equation as long as you do it to both sides. We want to get X (the unknown) on one side and the numbers on the other with the = sign between.**

So, remove the parentheses first to obtain (remember that a + sign in front of the parentheses leaves the sign of the numbers inside the parentheses unchanged--conversely, a - sign in front of the parentheses changes all the signs inside the parentheses when the parentheses are removed).

X - 9 = -5

Now add +0 to both sides.

X-9+9 = -5+9

Now combine the numbers

-9 and +9 add to zero on the left while -5 and +9 add to +4 on the right.

X = +4.

That is the way to move anything from one side to the other. If you wish to move a + number simply subtract that number from both sides; if you wish to move a - number simply add that number to both sides. An easier way is to move anything from one side to the other by moving it and changing the sign.

I hope this helps.

- algebra -
**carolina**, Tuesday, August 28, 2007 at 7:56pmyes thanx now i get it

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