y = x
so
y = 2y + 1
2y - y = -1
y = -1
x = y = -1
answer
(-1, -1) is the solution
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3x+ 2y = -1
x - 2y = 11 so x = 2y + 11
substitute x = 2y + 11 into 3x+ 2y = -1
3x+ 2y = -1
3(2y + 11)+ 2y = -1
6y + 33 + 2y = -1
8y = -34
y = - 17/4
x = 2y + 11
x = 2(-17/4) + 11
x = -17/2 + 11
x = 5/2
my answer is (5/2, -17/4)
I don't see any matching above