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Which of the following is an equation of a curve that intersects at right angles every curve of the family y = 1/x + k where k takes all real values?
a)y= -x b)y= -x^2 c)y= -x^3/3 d)y=x^3/3 e)y=ln x
a)y= -x b)y= -x^2 c)y= -x^3/3 d)y=x^3/3 e)y=ln x