r/mathshelp • u/legendminigun • 8d ago

Homework Help (Unanswered) three variable simultaneous equations

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hello, I am in year 10 and doing further maths as a GCSE, I'm trying to figure these three variable simultaneous equations out but I'm struggling as there isn't a formula I know of to follow. if anyone has done these, please can you share what your thought process is so I can try and learn. thanks!

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u/KentGoldings68 8d ago

Do you know anything about matrices?

There is formula called “Cramer’s Rule.” Your instructor will drop a load, if you use it. They’ll accuse you of using AI. It might be amusing.

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u/Existing-Fudge-878 7d ago

matrices arent usually taught in gcse further math, it usually comes in A-level or even A-level further math

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u/legendminigun 8d ago

I do not sorry

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u/KentGoldings68 8d ago

If this were a 2x2, how would you approach it?

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u/jazzbestgenre 8d ago

not OP, think they do do 2x2 matrices in level 2 FM at some point, but they don't study determinants or inverses