yes it is!
It is a linear equation in a single variable, x.
A consistent system.
No. Y=3X2+1 is a Binomial Equation.
It is a linear equation in one variable, x.
The value of x works out as -3
Yes because the exponents (powers) of the variables are 1.
3x plus 2y - 3 is an expression. There can be no answer to one expression and one linear equation in two variables.
It is linear.