y=2x+1 -2x+3y=-9 求算X和Yy=2x+1-2x+3y=-9 求算X和Y
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y=2x+1-2x+3y=-9求算X和Yy=2x+1-2x+3y=-9求算X和Yy=2x+1-2x+3y=-9求算X和Yy=2x+1-2x+3y=-9求算X和Yy=2x+1-2x+3y=-9求算X和Y
y=2x+1 -2x+3y=-9 求算X和Yy=2x+1-2x+3y=-9 求算X和Y
y=2x+1 -2x+3y=-9 求算X和Y
y=2x+1
-2x+3y=-9
求算X和Y
y=2x+1 -2x+3y=-9 求算X和Yy=2x+1-2x+3y=-9 求算X和Y
-2x+3(2x+1)=-9
4x+3=-9
x=-3
y=2×(-3)+1
=-5
两式相加消去x得3y+1=y-9,解得y=-5,带入任意式子中得x=-3
两式相加得3y+1=-9+y
所以y=-5
带入一式得x=-3
二元一次方程组
两式相加即可
X=-3
y=-5
x=-3 y=-5
y=2x+1 ①
-2x+3y=-9 ②
把①代入②中,化简得:
4x=-12
x=-3
把x=-3代入①中
y=-5
解得:{x=-3
y=-5
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