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Academic discussion and doubt solving for: Logarithms, Set Theory, Matrices & Determinants, Permutation & Combination, Probability, Binomial Theorem
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Transform the first equation using logarithms
Taking natural log of both sides of the first equation: ln[(2x)ln2]=ln[(3y)ln3]
(ln2)⋅ln(2x)=(ln3)⋅ln(3y)
(ln2)[ln2+lnx]=(ln3)[ln3+lny]
(ln2)2+(ln2)(lnx)=(ln3)2+(ln3)(lny) ... (1)
Transform the second equation using logarithms
Taking natural log of both sides of the second equation: ln[3lnx]=ln[2lny]
(lnx)(ln3)=(lny)(ln2)
Therefore: lnylnx=ln3ln2 ... (2)
Use substitution
From equation (2): lnx=ln3ln2⋅lny
Substitute this into equation (1): (ln2)2+(ln2)⋅ln3ln2⋅lny=(ln3)2+(ln3)(lny)
(ln2)2+ln3(ln2)2⋅lny=(ln3)2+(ln3)(lny)
Solve for ln y
(ln2)2−(ln3)2=(ln3)(lny)−ln3(ln2)2⋅lny
(ln2)2−(ln3)2=lny[(ln3)−ln3(ln2)2]
(ln2)2−(ln3)2=lny[ln3(ln3)2−(ln2)2]
(ln2)2−(ln3)2=lny[ln3(ln3)2−(ln2)2]
−[(ln3)2−(ln2)2]=lny[ln3(ln3)2−(ln2)2]
Therefore: lny=−ln3, which gives us y=31
Find x
From equation (2): lnx=ln3ln2⋅lny=ln3ln2⋅(−ln3)=−ln2
x=e−ln2
Therefore: x=21
The answer is 21 for the x-coordinate.