If: 6+y =37
Then: y = 31
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It is a linear equation in x. It has a solution, which is x = -5
This is a linear equation in two variables and the coordinates of each and every point on the line that it describes is a solution. A single linear equation does not have an "answer".
It is a linear equation in the single variable, m. It has the solution m = 0
The solution is (x, y, z) = (2.5, 1, 2.5).
y = 2x + 1 IS a linear equation!