If x $-12$y $=-210$ and x $-6$y $=90,$ then x $=$

Select this option for answer: $4$a$/4$b$4$a$/4$b

Select this option for answer: $4$b$/4$a$4$b$/4$a

Select this option for answer: $4$b $$ a$4$b $$ a

Select this option for answer: none of thesenone of these

Select this option for answer: $2/$x$+$y$2/$x$+$y

Select this option for answer: x$+$y$/$xyx$+$y$/$xy

Select this option for answer: $2/$xy$2/$xy

Select this option for answer: none of thesenone of these