diegodidi97 diegodidi97 19-08-2013 Matemática Respondido Calcule o valor de x e y nas seguintes igualdades: [tex]\left[\begin{array}{ccc}-3&x\\4&-1\\\end{array}\right] + \left[\begin{array}{ccc}y&-5\\3&1\\\end{array}\right] = \left[\begin{array}{ccc}8&1\\7&0\\\end{array}\right][/tex]