It is not. It is called a LINEAR equation.
This is because the word linear refers to a line and, if the solutions of the equation, in the form of ordered pairs (x,y), were plotted on a Cartesian plane, they would all lie on a straight line.
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y = 2x + 1 IS a linear equation!
That is called slope - intercept form
The equation contains variables which are only raised to the first power.
Assuming that the 2 in "5x2" is a power (5x2), then no, this is not a linear equation. It is a parabolic equation.
Yes, it is a linear straight line equation.