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I am having trouble understanding how to determine what is the lower and what is the upper bound in some calculus problems. For example:

Evaluate the double integral xydA, where D is the region bounded by the line y=x-1 and the parabola y^2=2x+6. Now you set it up to take the integral in terms of x first and the upper bound is y+1 and the lower is 1/2y^2+3...I guess im just confused on why it isnt the other way around not just in this problem but in general i have problems recognizing which is which. thanks