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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.
Variable
You will need to use your brain to figure that out. Different word problems need different equations.
The word "Linear" means "of degree one".
linear, unbending