An algebraic equation.
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.
A bivariate equation.
Multivariable equation
Multivariable equation
that's an equation.
An open sentence.
It is an equation. It could be an algebraic equation, or a trigonometric equation, a differential equation or whatever, but it is still an equation.
Literal Equation
A = b.
add one to the problem
An algebraic expression is an expression or and equation that contains at least 1 variable
Domain is the independent variable in an equation. It is what you put "in" the equation to get the Range.
I'm pretty sure it's an open sentence.