解方程:2x+y=4x-y-1/2=10+6x+2y/4
问题描述:
解方程:2x+y=4x-y-1/2=10+6x+2y/4
答
2x+y=4x-y-1/2
2x-2y-1/2=0
8x-8y-4=0 1式
4x-y-1/2=10+6x+2y/4
2x+6y/4+21/2=0
8x+6y+42=0 2式
2式-1式得到:
8x+6y+42-8x+8y+4=0
14y+38=0
y=-19/7 代入1式得到:
8x-8*(-19/7)-4=0
8x+152/7-4=0
8x=-124/7
x=-31/14
解得:x=-31/14 y=-19/7