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Step-by-step explanation:
substitute y into x
3(2y-1)+y=11
6y-3+y=11
add like terms
6y+y-3-11=0
7y-14=0
look for a common factor
7(y-2)=0
y-2=0
therefore y=0 or y=2
find x
if x=2y-1
x=2(0)-1
x=-1
if x=2y-1
x=2(2)-1
x=3
therefore (-1;0) and (3;2)