Number 3 alomost done

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)}

Find the values of y: 3y^3(y^2+ 2/3y)=0

Which of the following graphs could represent a quartic function?