Question 672273
{{{(x-1)^2(y+1)^2=4}}}


{{{sqrt((x-1)^2)*sqrt((y+1)^2)=sqrt(4)}}}


{{{(x-1)(y+1)=2}}} and {{{-(x-1)(y+1)=-2))}}}

{{{xy+x-1y-1=2}}}

{{{xy+x-y-1-2=0}}}

{{{xy-y+x-3=0}}}

{{{y(x-1)=-x+3}}}

{{{y=-(x+3)/(x-1)}}}

{{{y=(3-x)/(x-1)}}}......and {{{y=-(3-x)/(x-1)}}}


{{{ graph( 600,600, -10, 10, -10, 10, (3-x)/(x-1),(-3+x)/(x-1)) }}}

integer solutions:

{{{(x-1)<>0}}}...=>...if {{{x-1=0}}}, then {{{x=1}}}

for {{{x=0}}}, {{{y=-3}}}

for {{{x=-1}}}, {{{y=-2}}}

for {{{x=3}}}, {{{y=0}}}