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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.
That is called slope - intercept form
The equation y = 13x is in the form "y = mx + b" (in this case, b is zero). Therefore, the equation is linear.
A linear equation, when graphed, is always a line. A quadratic is a curve. Also, linear equations are of the form y=mx+b where m and b are arbitrary constants and quadratics are y=(x^2) +mx +b where m and b are arbitrary constants.
You can graph a linear equation slope intercept by solving the equation and plugging in the numbers : y=mx+b