пускай (4х+у)/у=t, тогда:
t+2=-1/t
t+2+1/t=0
(t²+2t+1)/t=0
t≠0
t²+2t+1=0
t1t2=1
t1+t2=-1
t1=-1
t2=-1
(4x+y)/y=-1
4x+y=-y
4x=-2y
y=-2x
{y=-2x
{х=-18÷у
{у=-2х
{х=-18÷(-2х)
{х²=9
{х=3
{у=-6
пускай (4х+у)/у=t, тогда:
t+2=-1/t
t+2+1/t=0
(t²+2t+1)/t=0
t≠0
t²+2t+1=0
t1t2=1
t1+t2=-1
t1=-1
t2=-1
(4x+y)/y=-1
4x+y=-y
4x=-2y
y=-2x
{y=-2x
{х=-18÷у
{у=-2х
{х=-18÷(-2х)
{у=-2х
{х²=9
{у=-2х
{х=3
{у=-6
{х=3