方程组计算(1)2x+3y=16 ,x+4y=13(2)7x-2y=3 ,9x+2y=-19(3) 3(x+y)-2(x-y)=7 ,2(x+y)-(x-y)=3

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方程组计算(1)2x+3y=16 ,x+4y=13(2)7x-2y=3 ,9x+2y=-19(3) 3(x+y)-2(x-y)=7 ,2(x+y)-(x-y)=3

方程组计算(1)2x+3y=16 ,x+4y=13(2)7x-2y=3 ,9x+2y=-19(3) 3(x+y)-2(x-y)=7 ,2(x+y)-(x-y)=3
方程组计算
(1)2x+3y=16 ,x+4y=13
(2)7x-2y=3 ,9x+2y=-19
(3) 3(x+y)-2(x-y)=7 ,2(x+y)-(x-y)=3

方程组计算(1)2x+3y=16 ,x+4y=13(2)7x-2y=3 ,9x+2y=-19(3) 3(x+y)-2(x-y)=7 ,2(x+y)-(x-y)=3
(1)2x+3y=16 ,x+4y=13
x=5,y=2
(2)7x-2y=3 ,9x+2y=-19
x=-1,y=-5
(3) 3(x+y)-2(x-y)=7 ,2(x+y)-(x-y)=3
x+y=-1,x-y=-5
x=-3,y=2