Question 310444
Simplify both equations first,
{{{3x+9y=33}}}
1.{{{x+3y=11}}} 
.
.
{{{-10x-6y=-14}}}
2.{{{-5x-3y=7}}}
Add them together to eliminate y.
{{{x+3y-5x-3y=11+7}}}
{{{-4x=18}}}
{{{highlight( x=-9/2 ) }}}
Then use either equation to solve for y.
{{{x+3y=11}}}
{{{-9/2+3y=11}}}
{{{3y=22/2+9/2}}}
{{{3y=31/2}}}
{{{highlight(y=31/6) }}}