x-3y=4 5-2x+9y=?

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x-3y=45-2x+9y=?x-3y=45-2x+9y=?x-3y=45-2x+9y=?5-2x+9y=5-(2x-9y)=5-2(x-3y)=5-2×4=-3确定没抄错吗ls5-(2x-9y)=5

x-3y=4 5-2x+9y=?
x-3y=4 5-2x+9y=?

x-3y=4 5-2x+9y=?
5-2x+9y=5-(2x-9y)=5-2(x-3y)=5-2×4=-3

确定没抄错吗
ls 5-(2x-9y)=5-2(x-3y 一看就不对
改个数才对

利用代入法
x=4-3y带入另一个式子
得到 5-4-3y+9y=0
1+6y=0
y=-1/6
x=9/4

X=4+3Y 5-2(4+3Y)+9Y=5-8-6Y+9Y=3Y-3或X-7

4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 (x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2 接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 x+y=5 2x+3y-z=9 x-y+z=4 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程有的话 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无 5x=3y,(2x+y)的平方=5x(x+y)+9