Pls help me with this problom i have 10 minutes left on my test???

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)}

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

How do you use the elimination method for this question? explain, because i really want to understand!