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# Simultaneous equations watch

1. Just having problems with this problem:

2a + ab = -1
a - 3b = 2

At the moment I'm just staring at it without a clue, although I'm guessing a third equation needs to be introduced. If someone could point me in the correct direction I'd be really grateful.

2. (Original post by coatsoft)
Just having problems with this problem:

2a + ab = -1
a - 3b = 2

At the moment I'm just staring at it without a clue, although I'm guessing a third equation needs to be introduced. If someone could point me in the correct direction I'd be really grateful.

Use the 2nd eq to write a in terms of b, then substitute into the 1st eq so you have a quadratic eq in b to solve.
3. (Original post by davros)
Use the 2nd eq to write a in terms of b, then substitute into the 1st eq so you have a quadratic eq in b to solve.
How I didn't spot that I don't know. Thanks .
4. Hi

I've moved this thread to the maths study help forum, as the university subject forums are for discussion about university courses/applying for those courses rather than help with specific problems.
5. (Original post by SlowlorisIncognito)
Hi

I've moved this thread to the maths study help forum, as the university subject forums are for discussion about university courses/applying for those courses rather than help with specific problems.
God, I wasn't having a good day. Sorry, don't know why I put it there.
6. (Original post by coatsoft)
God, I wasn't having a good day. Sorry, don't know why I put it there.
It's not a major problem, don't worry. I hope you're having a better day today

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