Posted by Samantha on Thursday, June 4, 2009 at 8:53pm.
Which equation is an identity?
a. 3x  9 = 3x
b. 4p + 7 = 7 + 4p
c. 2w = 0
d. 5k = 5

ALSO...  Samantha, Thursday, June 4, 2009 at 8:54pm
What's an identity?

Math (Algebra/PreAlgebra)  Reiny, Thursday, June 4, 2009 at 9:01pm
an identity is an equation which is true for all values of the variable
As a quick test, if you solve it, and you get a true statement, then it is an identity.
e.g. look at the first answer
3x  9 = 3x
9 = 0, which is NOT true, so Not an identity
but
4p + 7 = 7 + 4p
solving this we get
0 = 0 which is TRUE, so it is an identity.

Math (Algebra/PreAlgebra)  Samantha, Thursday, June 4, 2009 at 9:03pm
That makes so much sense! Thank you sooooooooo much! =]
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