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# Natural log simultaneous equations Watch

1. Anyone help with these?

x-y=e^5-e^2
ln(x)+ln(y)=7
2. (Original post by sch0501)
Anyone help with these?

x-y=e^5-e^2
ln(x)+ln(y)=7
ln(x)+ln(y)=ln(xy)=7

You can get xy from that, hence y, so sub it into the first one solve for x. Then get y.
Be careful with one of the solutions though as it will not be valid, try and see why.
3. (Original post by RDKGames)
ln(x)+ln(y)=ln(xy)=7

You can get xy from that, hence y, so sub it into the first one solve for x. Then get y.
Be careful with one of the solutions though as it will not be valid, try and see why.
thanks

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