What is the coefficient of x in the expression 6x - 4?

In the expression 6x - 4, the coefficient of a variable is the numerical factor that multiplies that variable. Here, the term involving the variable x is 6x. The number 6 is directly multiplied by x, making it the coefficient. The other term, -4, is a constant and does not have any variable associated with it, so it does not contribute to the coefficient of x.

Thus, identifying 6 as the coefficient of x in this expression solidifies the understanding that the coefficient reflects how many times the variable is counted, which, in this case, is 6 times.