作业帮5x-y=3,0.2x+0.3y=-0.9
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/19 14:37:49
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5x-y=3,0.2x+0.3y=-0.9
5x-y=3,0.2x+0.3y=-0.9
5x-y=3,0.2x+0.3y=-0.9
5x-y=3,
0.2x+0.3y=-0.9
y=5x-3
0.2x+0.3(5x-3)=-0.9
0.2x+1.5x-0.9=-0.9
1.7x=0
x=0
y=5*0-3=-3
x=0
y=-3
5x-y=3
15x-3y=9 ①
0.2x+0.3y=-0.9
2x+3y=-9 ②
①+②得17x=0 x=0
将x=0代入5x-y=3
得y=-3
【答案】x=0 y=-3
5x-y=3，
0.2x+0.3y=-0.9
整理得
{5x-y=3①
{2x+3y=-9②
将①*3+②得
15x+2x=9-9
17x=0
x=0
将x=0代入①得
y=-3
∴原方程组的解为
{x=0
{y=-3
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