Help me please There are 9
9
books stacked on a shelf. The thickness of each book is either 1
1
inch or 2
2
inches. The height of the stack of 9
9
books is 14
14
inches. Which system of equations can be used to determine x
x
, the number of 1
1
-inch-thick books in the stack, and y
y
, the number of 2
2
-inch-thick books?
F. x+y=14x+2y=9
x+y=14x+2y=9

G. x+y=92x+y=14
x+y=92x+y=14

H. x+y=9x+2y=14
x+y=9x+2y=14

J. x+y=142x+y=9
x+y=142x+y=9