Question

{2X=5(X+Y) 3X-10(X+Y)=2

Answer 1

...1
x/2+y/3=2............2
先化简,由1式得
4x-y-5=0...........3
由2式得
3x+2y-12=0............4
3式*2+4式得
8x+3x-10-12=0,
x=2,
y=3

2(x-y)/3 - (x+y)/4=-1.........1
6(x+y)-4(2x-y)=16..........2
解：由1式得
8（x-y）-3(x+y)=-12
5x-11y+12=0............3
由2式得
10y-2x-16=0 ...........4
3式*2+4式*5得
28y-56=0
所以 y=2
将y=2代入1式得
x=2

Answer 2

x=-2,y=6/5.先整理移项得{5y=3x=0,7x+10y+2=0，再解方程组可得结果。