Help with math plz asap

Find two rational expressions that have the difference of 2-n/n-4

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?