Mary has 84 books. 3/4 of them are fiction books. 2/3 of the fiction books are on science fiction. How many science fiction fict
1 answer:
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Answer:
1. y=5-2x
2. -y=5-2x
3.
Step-by-step explanation:
1. 2x+y=5
y=5-2x
2. 2x-y=5
-y=5-2x
3. x+2y=5
2y=5-x