Question 1104315
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The response from the other tutor is either misleading, or just wrong -- depending on what question she was answering.  She did not write the given expressions in terms of y, as your question asked....<br>
{{{ln(5/3) = ln(5)-ln(3) = y-x}}}
{{{ln(45) = ln((3^2)*5) = ln(3^2)+ln(5) = 2ln(3)+ln(5) = 2x+y}}}