The graph of the equation xy = k

Jeffrey Braganza

Given xy = k and k is -ve
=> xy = -ve
for xy to be -ve:
i) x is -ve and y is +ve e.g. (-1,1)
ii) x is +ve and y is -ve e.g. (1,-1)

Hence xy lies in quadrant II & IV

Dec 31, 2015 • Comment