回答: #y = -4x-5# 説明: #y = 2x ^ 2 + x-10x-5-2x ^ 2 + 5x# #y = -4x-5# 回答: #4 x + y + 5 = 0# 説明: #y =(x-5)(2x + 1) - 2x ^ 2 + 5x# #y = 2x ^ 2 - 10x + x - 5 - 2x ^ 2 + 5x# #y = -10 x + x - 5 + 5 x = -4 x -5# #4 x + y + 5 = 0#