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You cannot solve one linear equation in two unknown variables.
No. In the variable x, alone, it is linear. In the variable y, alone, it is linear. But taken together, in x and y, you have a term which contains xy - that is, a term in which the powers of the unknowns add to 2. So the equation is not linear.
3x
Linear. The only power for the variables is 1.
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yes it is!
Without an equality sign the given expression is not an equation
Yes.
yes it is one
A consistent system.
It is a linear equation in a single variable, x.
It is a linear equation in one variable, x.
A nonlinear relationship is one that cannot be expressed using a line. y=3x is a linear relationship between x and y. y = log(x) is nonlinear.