Math (Algebra/Pre-Algebra)

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Which equation is an identity?

a. 3x - 9 = 3x
b. 4p + 7 = 7 + 4p
c. 2w = 0
d. 5k = 5

  • ALSO... -

    What's an identity?

  • Math (Algebra/Pre-Algebra) -

    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/Pre-Algebra) -

    That makes so much sense! Thank you sooooooooo much! =]

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