C-12-Q043mediumsingle_mcqThe solution (x,y)(x, y)(x,y) of 7x−3y=31, 9x−5y=417x - 3y = 31,\; 9x - 5y = 417x−3y=31,9x−5y=41 is —a(4,1)(4, 1)(4,1)b(4,−1)(4, -1)(4,−1)c(−4,