Yes it is the equation for a vertical line (parallel to the y-axis), intersecting the x-axis at the point (3,0). There is not a y component in this equation, because at any value of y, x will always equal 3.
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Good news! You don't have to do anything. [ x-3 = 2 ] is already a linear equation, and x=5 .
Yes.
4
A linear equation is the equation of a line and that consists of an infnite number of points. What you have, in x = -4 and y = -1/3, is a single point. A single point is not a line and so there cannot be a linear equation (suitable for a line) to represent a point.
no, because xx=x squared, and x squared is not linear