1. The problem statement, all variables and given/known data The problem is Find the equation of the line with a positive slope that is tangent to the ellipse (x^2)/9 + (y^2)/4 = 1 At x=2 2. Relevant equations Now I know that to find the tangent, I find the derivative of the equation. So I got 2x/9 + 2y/4 dy/dx = 0 But its this part where I cant go any further. See I only get X, so I cant solve for dy/dx without having y in the answer, and therefor I cant solve for y. I solved for dy/dx and got -16/18y, and just tp test I found what was Y when x = 2 for the original equation, it was 0.37. So I adding 0.37 into -16/18y, i got -2.4 (which would be the slope of the line) But it says find the line with the positive slope, after reading through the entire chapter in my textbook, and searching the internet, I am stuck and don't know what I'm doing wrong.