Question 1177920


{{{x-2y=4}}}........both sides multiply by {{{2}}}
{{{3x+4y=2}}}
--------------------------
{{{2x-4y=8}}}
{{{3x+4y=2}}}
----------------------add both eq.

{{{2x-4y+3x+4y=8+2}}}

{{{2x-cross(4y)+3x+cross(4y)=8+2}}}

{{{5x=10}}}

{{{x=2}}}

go to

{{{x-2y=4}}}.........substitute {{{x}}}

{{{2-2y=4}}}

{{{2-4=2y}}}

{{{-2=2y}}}

{{{y=-1}}}