MathematicsMedium128×since 2002Q5565If a variable line drawn through the intersection of the lines x3+y4=1{x \over 3} + {y \over 4} = 13x+4y=1 and x4+y3=1,{x \over 4} + {y \over 3} = 1,4x+3y=1, meets the coordinate axes at A and B, (A ≠\ne= B), then the locus of the midpoint of AB is :A6xy = 7(x + y)B4(x + y)² − 28(x + y) + 49 = 0C7xy = 6(x + y)D14(x + y)² − 97(x + y) + 168 = 0Check answerSkip