Posted by James on Tuesday, November 13, 2012 at 10:08am.
dx/dt = 2t-2
dy/dt = 2t+2
when t=1
slope = dy/dx = (dy/dt) / (dx/dt) = 4/0 , ahhh, a vertical line
when t=1
x = 1-2 = -1
y = 1 + 2 = 3
so a vertical line through (-1,2) is
x = -1
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