解方程组:{x-y=4,3x+4y=19
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解方程组:{x-y=4,3x+4y=19
解方程组:{x-y=4,3x+4y=19
解方程组:{x-y=4,3x+4y=19
x-y=4…………①
3x+4y=19…………②
①×4+②得
7x=35
x=5
把x=5带入①得
5-y=4
y=1
∴x=5,y=1
x-y=4 (1)
3x+4y=19 (2)
由(1)得y=x-4
代入(2)
3x+4x-16=19
7x=35
所以
x=5
y=x-4=-1
x-y=4
3x+4y=19
y=x-4代入:
3x+4(x-4)=19
3x+4x=19+16
7x=35
x=5
y=x-4=5-4=1
x=5
y=1
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