Question 92586
{{{x+3(y-1)=11}}}
{{{2(x-y)+8y=28}}}


Distribute for both equations

{{{x+3y-3=11}}}
{{{2x-2y+8y=28}}}



{{{x+3y=11+3}}} Add 3 to both sides for the 1st equation
{{{2x-2y+8y=28}}}


Combine like terms

{{{x+3y=14}}} 
{{{2x+6y=28}}}



*[invoke solving_linear_system_by_elimination 1, 3, 14, 2, 6, 28]