There are 12 books stacked on a shelf. The thickness of each
book is either 2 or 3 inches. The height of the stack of books is
35 inches. Which system of equations can be used to determine
x, the number of 2 inch books and y, the number of 3 inch
books?
a) x+y=12
b) x+y=12
2x+3y=35
3x+2y=35
c) x+y=35
2x+3y=12
d)
x+y=35
3x+2y=12
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