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Posted by **SO LOST** on Sunday, February 20, 2011 at 10:48pm.

solve for x using the addition principle

x+10=-13

Now I added 10 to both sides 10 + 10 that gives me 20

then I added -13 +10 = -3

my x is the 20 or did I mess this problem up all the way around?

- math algebra -
**Ms. Sue**, Sunday, February 20, 2011 at 10:51pmYou need to subtract (not add) 10 to both sides of the equation. The purpose is to get the unknown quantity on one side and the known quantity on the other side.

x + 10 - 10 = -13 + (-10)

x = -23

- math algebra -
**kLb**, Sunday, February 20, 2011 at 10:52pmyou -10 from both sides not add

[do the opposite]

so x=-23

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