I don't understand your question fully, try to list your full problem in the future and maybe people will be able to better help you.
Answer:
l think they meet when collecting like terms.maybe like this
y=4x8
y=3x+1
=(4×+3x)+1+8
Answer:
it would be the first one
Step-by-step explanation:
Answer:

Step-by-step explanation:
(5x^3+4x^2)−(6x^2−2x−9)
To find the opposite of 6x^2−2x−9 find the opposite of each term.
5x^3+4x^2−6x^2+2x+9
Combine 4x^2 and 6x^2 to get −2x^2.
5x^3-2x^2+2x+9