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January 31, 2015

January 31, 2015

Posted by **lori** on Friday, February 8, 2013 at 11:29pm.

9x^2+xy+9y^2=19, (1,1) (ellipse)

- calculus -
**Steve**, Saturday, February 9, 2013 at 3:01pm18x + y + xy' + 18yy' = 0

y' = -(18x+y)/(x+18y)

at (1,1) y' = -1

so, the line is

y-1 = -(x-1)

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