It is 2
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The slope is the coefficient of x in the standard form and so it is 2.
It is the unwritten coefficient. For example, 2x + y represents 2x + 1y, but since the coefficient of y is 1, it is not made explicit.
The period of the tangent function is PI. The period of y= tan(2x) is PI over the coefficient of x = PI/2
y=2x y-2x=0 or 2x-y=0