- #1
physmatics
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Homework Statement
Calculate the double integral over D
[tex]\int\int x*ln(2x + y)/y^3 dx dy[/tex]
D is the finite area in the xy-plane within the straight lines
[tex]2x + y = 1[/tex]
[tex]2x + y = 3[/tex]
[tex]x = y[/tex]
[tex]x = 2y[/tex]
Homework Equations
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The Attempt at a Solution
I thought it was obvious to make the variable substitution
[tex]u = x/y
v = 2x + y[/tex]
which gives us the boundaries
[tex]1 \leq u \leq 2
1 \leq v \leq 3[/tex]
So far so good. Now, the problem is that I can't really substitute the whole integral. I thought this would solve itself by the Jacobian, but it turns out to be
[tex]y^2/2x + y[/tex]
which I really don't need.
Should I really use this variable substitution? I don't know what else to do.