2x + 6 = 1
Is this a statement or a non-statement ?
What about 3x²+x-6 = 4 ?
I am not sure whether those equations are true statements or false statements or both since x is a variable.
A mathematical statement is one in which the truth value is either true or false, like 1+2=3. Since you cannot attribute a truth value to your example, they would not be considered statements until a value of x becomes part of the hypothesis as in "If x=-5/2 then 2x+6=1".