[tex]\displaystyle \left \{ {{9x+y=-24} \atop {3x+4y=-30}} \right. \\\\\left \{ {{y=-24-9x} \atop {3x+4y=-30}} \right.\\ \\3x+4(-24-9x)=-30\\x=-2\\y=-24-9(-2)\\y=-6\\(x,y)=(-2,-6)[/tex]