y=5x-3和y=-2x+3哪一个y随x的增大而减小

y=5x-3和y=-2x+3哪一个y随x的增大而减小 已知2x-3y+5x+2y=1求x,y的值 随便哪一个都行 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x |x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少 2x+1=4y+2x和5x-6y=7+x 哪一个是二元一次方程? x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3x+2y=5 3y+2x=5 求x和y 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 5x+y=2,x-3y=4,求x和y,