Needs to be answered fast (algebra)

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)}

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

What is the equation of the line that is parallel to the line with the equation y= -3/4x +1 and passes through the point (12,-12)