99katieway
99katieway
23-10-2017
Mathematics
contestada
Someone please help me with number 20
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daijingyi722
daijingyi722
23-10-2017
(1) let there be x book and let the total cost be y dollars.
y=19.25x+40
y=16x+69.25
(2) 19.25x+40=16x+69.25
3.25x=29.25
x=9
9 silver book, 9 gold book.
(3) y=19.25x+40=19.25*9+40=213.25 dollars
both companies' total cost are 213.25 dollars.
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