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Natural log simultaneous equations

sch0501

Anyone help with these?

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

Reply 1

RDKGames

Study Forum Helper

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.

(edited 7 years ago)

Reply 2

sch0501

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.