回答: #y = 6# #x = -4# 説明: #-3x-2y = 0# #9x + 5y = -6# #-2y = 3x# #9x = -5y-6# #y = -3x / 2# #9x = 15x / 2-6# #y = -3x / 2# #18x = 15x-12# #y = -3x / 2# #3x = -12# #y = 12/2# #x = -4# #y = 6# #x = -4#