Answer:
Yes. 3x²y and -5x²y are like terms because the variables x and y have the same exponents.
I believe its 4 we haven't really went over it
Is there a specific question that you want to ask?
The sum of two numbers will be zero when you have the same number and one is positive and one is negative. For example 1 + -1= 0
{(3,0),(6,1),(9,2)} because
when you plug in the values you get
3-3=3(0) = 0=0
6-3=3(1) = 3=3
9-3=3(2) = 6=6
