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Sagot :
Cost of each paperbook = $6,95
bonus points earned =2
Cost of each hardcover book = $19.95
Bonus points earned = 4
Cost of order = $60.75
Total points earned = 14
Points:
2p + 4 h= 14
P= paper books
h= hardcover books
Money:
p6.95+h19.95 = 60.75
So, we have the system of equations:
2p + 4 h= 14
p6.95+h19.95 = 60.75
Solve for p the first equation:
2p+4h=14
2p=14-4h
p= (14-4h)/2
p= 7-2h
Replace p in the second equation:
p6.95+h19.95 = 60.75
(7-2h)6.95+h19.95=60.75
Solve for h:
48.65-13.9h+19.95h=60.75
-13.9h+19.95h=60.75-48.65
6.05h= 12.1
h= 12.1/6.05
h= 2
2 hardcover books
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