Question 137276
Let's expand both equations and see what we get.
1.{{{x+3(y-1)=11}}}
{{{x+3y-3=11}}}Distribute.
{{{x+3y=14}}}Simplify.
2.{{{2(x-y)+8y=28}}}
{{{2x-2y+8y=28}}}Distribute. 
{{{2x+6y=28}}}Simplify.
{{{x+3y=14}}}Divide both sides by 2. 
Equations 1 and 2 are the same equation. 
That is, the system of equations is dependent.