用代入法解下列方程组{x-y-6,2x+3y-8
问题描述:
用代入法解下列方程组{x-y-6,2x+3y-8
答
{x-y-6=0 (1)
,2x+3y-8=0 (2)
x-y-6=0
x=y+6
2(y+6)+3y-8=0
2y+12+3y-8=0
5y=-4
y=-4/5
x=26/5