1. The problem statement, all variables and given/known data I'm attempting Q 3 from ch 16.4 of Stewart (p 1060). We are required to find the line integral where C is the triangle with vertices (0,0), (1,0) and (1,2). The line integral is Int xy dx + x^2*y^3 dy 2. Relevant equations 3. The attempt at a solution I'm having trouble parametizing the vertical line between (1,0) and (1,2). I'd let y = 2t and x = 1, but got the wrong final answer. I suspect it's because line (1,0) to (1,2) was incorrectly expressed. I then wanted to integrate in terms of dy, with terminals for y of 0 and 2, and parametizing y in terms of y, but where does that leave the dx in the first part of the equation? I imagine it would be easier to use Green's Theorem, but the question specifically requires the use of line integrals.