Y 2x 1 is a linear equation. While in two variable the solution is represent by a line parallel to x or y axis. Y 2x 1.
Since x 1 for all values of y.
Equation of lines which are parallel to y-axis is. Y 2x 1 is a linear equation. When x is 0 y is already 1. It is customary to denote the variables in such equations by x and y but other letters may also be used.