用消元法求2x+3y=0、3x+5y=—1(急,

问题描述:

用消元法求2x+3y=0、3x+5y=—1(急,

2x+3y=0,则x=-3/2y 代入3x+5y=—1,得
-9/2y+5y=-1
1/2y=-1
则y=-2
则x=-3/2y=3