已知x的平方减y的平方等于6,y等于负x加3,则x等于多少,y等于多少

网友回答

x²-y²=6
y=-x+3
代入x²-(-x+3)²=6
x²-x²+6x-9=6
6x=15所以x=5/2y=-x+3
=1/2======以下答案可供参考======
供参考答案1:
X*X-Y*Y = 6 => (X+Y)*(X-Y)=6
Y=-X+3 =>X+Y =3=>3(X-Y)=6 =>X-Y=2=>X=2.5,Y=0.5
供参考答案2:
x^2-y^2=6,y=3-x,代入,得到
x^2-(3-x)^2=6
6x-9=6,
x=5/2y=3-x=1/2
供参考答案3:
(x+y)(x-y)=6
y=-x+3
所以x+y=3
x-y=2所以x=2.5
y=0.5