Yes, since (1,2) satisfies
y = x + 1
y = (1) + 1
y = 2
and
2 = 2
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6x = 1 x = 1/6
YES ! When x = -1 then y = 3(-1) + 2 = -3 + 2 = -1
There is one solution for x and one solution for y. The solution is: x = -1 ; y = 2
Both of them are equations!The solution is (x, y) = (2, 1).
x=1, y=5 is a legitimate answer.