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The letter "I" is normally used for direct current, or for the average current in the case of AC. The lower-case version, "i", is used for the instantaneous current, in the case of AC.
Quite simply, it doesn't.
It is the x-axis, APEx
Equivalent equations are equations that have the same solution set.
It could be: y = -2x+3 whereas -2 is the slope and 3 is the y intercept