-3xy is a monomial where x and y are variables and -3 is the coefficient of the monomial.
If we know the value of y, we have to substitute it for y, and we say that -3(y-value) is the coefficient of x.
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3xy - 3xy = 0
-1
OK, say you have a variable like X. 3X 3 is the variable X's coefficient
3xy and 2xy. You can see that 3xy and 2xy have something in common with each other. They both have xy and the end of them. Hope this helped.
The coefficient is 6.