An algebraic equation.
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An open sentence.
A = b.
Yes.
The word linear means in a straight line. If the graph is a line, it is linear. Also, linear equations are of the first order; they contain a variable but not a square (or higher power) of a variable. If the equation contains x2 it is not linear.
Squared means to the power 2. An wxample would be x2 = 25.