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October 21, 2014

October 21, 2014

Posted by **Help!** on Friday, August 31, 2012 at 1:25am.

A) -6(x-3)+5 = -2x+10

I solved this and got x = 13/4. How am I suppose to figure out whether its identity or conditional equation?

Same goes with this problem

B) -7(x-3)+4x = 3(7-x)

-7x+21+4x = 21-3x

-21-3x = 21- 3x ?

- Math -
**MathMate**, Friday, August 31, 2012 at 11:19am(A)

x=13/4 means that the equation is valid*only*at x=13/4, and is not valid elsewhere.

Would that be an identity or a conditional equation?

(B)

There was an arithmetical error on the last line:

-7x+21+4x = 21-3x**+**21-3x = 21- 3x

So after cancelling, we get

21=21

Would that be a conditional equation or an identity (i.e. true for all values of x)?

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