Question 1130339
{{{3x-y= 9}}}....eq.1-> both sides multiply by {{{3}}}
{{{4x+ 3y= -1}}}.......eq.2
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{{{9x-3y= 27}}}....eq.1
{{{4x+ 3y= -1}}}.......eq.2
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{{{9x-3y+4x+ 3y= 27+(-1)}}}

{{{9x- cross(3y)+4x+ cross(3y)= 26}}}

{{{13x= 26}}}

{{{x= 26/13}}}

{{{x= 2}}}


{{{3x- y= 9}}}....eq.1-...plug in {{{x= 2}}}

{{{3*2- y= 9}}}

{{{6- 9= y}}}

{{{y=- 3}}}


solution:

({{{x}}}, {{{y}}}) =({{{2}}},{{{-3}}})