college calculus
posted by daren .
a point is moving on the graph of xy=30. when the point is at (6,5), its xcoordinate is increasing by 6 units per second. how fast is the ycoordinate changing at the moment

college calculus 
bobpursley
xy=constant
y dx/dt+ x dy/dt=0
you know x,y, and dx/dt solve for dy/dt
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