Question 1209242
{{{system(-2x+y=-15,2x+3y=-15)}}}


Add corresponding parts.

{{{0+4y=-30}}}


{{{y=-30/4=-15/2}}}



Now find x.
{{{2x-y=15}}}

{{{2x=y+15}}}

{{{x=(y+15)/2}}}

{{{x=(-15/2+15)/2}}}

{{{x=(-15/2+30/2)/2}}}

{{{(15/2)/2}}}

{{{15/4}}}



x,  {{{15/4}}}

y, {{{-15/2}}}