BRAINLIEST - Can somebody help me with this question?

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 factored form of the following expressions? d^2 – 13d + 36

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39