已知3x^2-xy-4y^2=0,且x+y≠0,说明y=3/4x

问题描述:

已知3x^2-xy-4y^2=0,且x+y≠0,说明y=3/4x

3x^2-xy-4y^2=0
(x+y)(3x-4y)=0
3x=4y
y=3/4x