it is an expression
No, if there is a sqaured variable, the equation is not linear.
It is a linear expression.
It is a linear expression in two variables. As an expression it cannot be solved. Furthermore, to solve equations in two variables you need at least two linear equations.
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It could be a function or a linear expression.
No, if there is a sqaured variable, the equation is not linear.
It isa linear expression,a binomial expression,an algebraic expression,a polynomial expression.
No, it could be a constant.
I think the word you're looking for is "exponential". A linear expression is of the form ax + b whereas an exponential expression is of the form x^a + b.
It is a linear expression.
It is a linear expression.
It is a linear expression in two variables.
Without an equality sign the given expression can't be considered to be a linear equation.
It is a linear expression in two variables. As an expression it cannot be solved. Furthermore, to solve equations in two variables you need at least two linear equations.
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It could be a function or a linear expression.