3x-4y=2;4x-3y+4=0
2个回答
相加 7x-7y=-2 => x-y= -2/7
相减 -x-y=6
再相加 -2y=40/7 => y=-20/7 => x=18/7
相关问题
1.3x+3y-z=16 2.3(x+y)-4(x-y)=4 3.0.4x+0.3y=0.7
4x^3-4x^2y-xy^2+y^3=0
X^4-2x²y-4xy^3+4x^3y+y²(4x²+3/4y²)
4x+y-4=0;2x^2+3y^2-4x=0怎么求x和y
解下列方程组(1){y=1-x,4x-3y=5 (2){2x-y=3,3x+y-1=0 (3)2x+3y=-4,2x-4
解下列方程组:{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(
(1)y=x^2-7x=6 (2)y=3x^4+4x^3 (3)y=x^3-x^2-4x+4 (4)y=2x^2-x^4
4x+3y=6,2x+y-4=0
-2x^4y^2-4/3x^3y^3+4/5x^2y^4
解方程组(3x+4y-3)(3x+4y+3)=0&3x+2y=5