SOLUTION: Please help: the textbook for a biology class costs $15 more than twice the cost of a used Algebra book. If the cost of the two books together is $219. Find the cost of each boo

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Question 617687: Please help: the textbook for a biology class costs $15 more than twice the cost of a used Algebra book. If the cost of the two books together is $219. Find the cost of each book.
Thanks
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the price of the algebra book
Let B be the price of the biology book.
You are told
A+%2B+B+=+219
B+=+2A+%2B+15
substitute the value for B in this second equation into the first one
A+%2B+%282A%2B15%29+=+219 now simplify and solve for A
3A+%2B+15+=+219
3A+=+204
A+=+204%2F3
A+=+68
you have A, now solve for B using the second equation above