C-05-Q093mediumsingle_mcqOne solution of 18yx−y2x=81, 3x=y218 y^x - y^{2x} = 81,\ 3^x = y^218yx−y2x=81, 3x=y2 is —a(2,3)(2, 3)(2,3)b(3,2)(3, 2)(3,2)c(2,−3) only