find the slope of the curve given by x^2+y^2+2x-4y-20=0 at (2,6)
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x²+y²+2x-4y-20=0
x=2 y=6
2²+6²+2×2-4×6-20=0
4+36+4-24-20=0
44-44=0
0=0
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