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Thanks so much to the people who helped me on my last FRQ: The FRQs are the only thing keeping my grade above a D (I failed two quizes, because I wasn't prepared Dx) I have another one to do, so if you could please help me again, I'd really appreciate it. I figured out most of it, I just need to be sure that its correct.

(Right click, view image - for bigger/more readable image)

I got the first one. For the second one, I got (1,3) and (1,-2). For the lines: 2x+1 and 2x-4. But I don't know if I did it correctly. Here's my work: large image

For C, I thought I needed to find when dy/dx does not exist, but I don't know what to do since there are two variables. I would guess one would be at 0, but I'm thinking there will be another point at which the tangent line is veritical.

Thank you so so so much in advance!