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OpenStudy (anonymous):
find the equation of the tangent line to 9x^2+16y^2=52 through (2,-1) A. -9x+8y-26=0 B. 9x-8y-26=0 C. 9x-8y-106=0 D. 8x+9y-17=0 E. 9x+16y-2=0
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OpenStudy (anonymous):
differentiate the equation to find dy/dx......... We know that point (2,1) lies on the ellipse so slope=9/8. You got slope and a point so create d equation
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