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posted by Donna Saturday, August 23, 2008 at 4:56pm.

$ 45= 3 books 3 Pens $ 177= 11 Books 12 Pens Cost of b= P=

3 p + 3b = 45 11 b + 12 p = 177 12 b + 12 p = 180 Subtract the second equation from the third. b = 3. 9 + 12 p = 177 12 p = 168 p = ?

I made a mistake near the end. 3p + 9 = 45 3p = 36 p = 12

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