Proving Definite Integral Using Substitution | Solving Math Problem

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Homework Statement


prove by substitution that definite integral int (1/t)dt from [x to x*y] = int (1/t)dt from [1 to y].


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The Attempt at a Solution


i can do this problem if i integrate and use the log laws, no probs, but the question says to use a substitution, I've tried many but to no avail, a push in the right direction would be greatly appreciated. I've asked yesterday about a similar question, which thanks to the forums help i understand. this is the last one on the section and then ill be confident that i can put it rest.
 
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Try the obvious, u=t/x.
 
thks very much, I've learned more of these two questions, than the previous easier 30.
 
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