Question 1000483

{{{x/2+y/4=1}}}.....eq.1..........both sides divide by {{{2}}}
{{{-x/4-y/8=1}}}.......eq.2
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{{{x/4+y/8=1/2}}}.....eq.1
{{{-x/4-y/8=1}}}.......eq.2
----------------------------add both eq.1 and eq.2

{{{x/4+y/8-x/4-y/8=1/2+1}}}

{{{cross(x/4)+cross(y/8)-cross(x/4)-cross(y/8)=1/2+2/2}}}

{{{0<>3/2}}}=> there is no solution; lines are parallel to each other,this system is inconsistent

{{{ graph( 600, 600, -10,10, -10, 10, -2x+4, -2x+8) }}}