Re: finding the value of x

Hmm - it's not always easy. In this case, the minus sign (in the final
line
of the solution) is shown in front of the dividing line, not against
denominator or numerator. Seeing it hand-written helps me to understand
why
the OP may take more than a moment to get his head round this.

Thank you for your contribution Martin,
As Cody's father, I encourage him to be independent
and therefore seek his own resolution.
The problem deepens because I left school at 15 and whilst
I (think) Ican handle his work thus far, it was I, who marked his
answer as incorrect.
He thus asked me why, I can't answer it, hence my suggestion
he ask on the web.
His work comes in booklets, which parents have to mark and sign
Take for example his latest work going to a new level.

simultaneous linear equations in two levels.
http://cjoint.com/data/eddh7BHu2E.htm

The method is explained, but the mechanics or the practicalities
are not suggested, supplementary reading/info is not suggested either.
He is going this alone therefore, apart from a few minutes he can
snatch form his tutor, who he sees once a week.

I understand the regime of having the student think problems
through, but sometimes one needs an explanation to "kick start"
a process. I'm sure at the moment these are just heiroglyphs to him.
I remember he had a problem long ago with long division,
after I found the problem located in the extension of zeroes
concept, he rattled through his work.

BTW I still am unable to explain to him, why the negative
sign changes postion from the denomonator to the divisor line :)
Every question he asks, he gets a question in response.

We are probably meddling in the domain of the intelligentsia,
we need a link to be amongst others of similar progress,
but I am dashed if I can find one at the moment.
Rodney












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