2019中考数学总复习第二轮纵向小专题复习专题5二元一次方程组课件.ppt

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第二轮 纵向小专题复习,专题5 二元一次方程组,1 解方程组:,解:把代入,得:7x-6x=2,解得:x=2,将x=2代入,得:y=6,,2 解方程组:,解:把代入,得:2(y+1)-y=3,解得:y=1,把y=1代入,得:x=2,,3 解方程组:,解:-得:3x=-12,解得:x=-4,把x=-4代入,得:y=8,,4 解方程组:,解:由2,得4x+2y=8,-,得3x=3,解得x=1,把x=1代入,得,y=2,,5 解方程组:,解:3+2得:17x=34,解得:x=2,把x=2代入,得:6+2y=4,解得:y=-1,,6 解方程组:,解:3-2得:11x=22,解得:x=2,将x=2代入,得:10-2y=4,解得:y=3,,谢谢!,

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