C-05-Q067mediumsingle_mcqOne solution of x2+y2=61, xy=−30x^2 + y^2 = 61,\ xy = -30x2+y2=61, xy=−30 is —a(6,−5)(6, -5)(6,−5)b(5,6)(5, 6)(5,6)c(−6,−5)(-6, -5)(−6,−5)d(6,5)(6, 5)(6,5)