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# Simultaneous Equation Problem. watch

1. Hey again, I've not yet learnt how to do this, can anyone shed some light on it for me? Thanks.

a) Show that the elimination of from the simultaneous equations:

Produces the equation:

I'm not sure where the 5 comes from.
2. typo?
3. theres a mistake in the question
4. (Original post by dichr0ic)
typo?
(Original post by didgeridoo12uk)
theres a mistake in the question
I thought as much, I've noticed a few typo's in this book.

Thanks for the help.
5. (Original post by Srxjer)
Hey again, I've not yet learnt how to do this, can anyone shed some light on it for me? Thanks.

a) Show that the elimination of from the simultaneous equations:

Produces the equation:

I'm not sure where the 5 comes from.
I assume you mean

?

First, rearrange the first equation to get .
Then you can replace the in the second equation with the you found.

Multiply out the bracket and bring everything to the left hand side & you have the answer.

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