It is the number that multiples the variable as for example 2x means 2 times x and here 2 is the coefficient of x.
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The coefficient
There is the Index, the coefficient and the Radican
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.
A numeric coefficient is simply a number that is being multiplied by something else. For example, in the term: 3a the number 3 is a numeric coefficient of the term "a". This is just a short way of expressing multiplication. That term means the same thing as: 3 × a
The answer depends on the what the leading coefficient is of!