Identify the coefficient of each term of the polynomial.
-2x+9
what is the coefficient of the first term is

what isthe coefficient of the second term is

There are two parts of an equation (including this one), the coefficient, and the variable. 
The coefficient is a known number, written as a digit, whereas the variable is an unknown number, written as a letter to signify an unknown number.

So, the coefficient in the first term (or part of the equation) is -2. The coefficient in the second term is 9, and the variable in this equation is x.