7-x+3y=3y+4+5 7-x+3y=7-3x+5怎么解
问题描述:
7-x+3y=3y+4+5 7-x+3y=7-3x+5怎么解
答
7-x+3y=3y+4+57-x+3y=3y+97-x=9x=-2
7-x+3y=7-3x+57-x+3y=12-3x 7+2+3y=12+6 3y=18-9 y=3