Answer: to make 78 copies it cost 26 dollars.
Step-by-step explanation:
18 copies - 6 dollars
78 copies - x dollars
Hence,

Answer:
-1
Step-by-step explanation:
You have to do rise over run.
One thing we already know is that the slope is negative because it's pointing in this direction \ <======
I will make a picture.
But the rise is 4 and the run is 4 so the slope is -1x or just -x
Hope this helps ya!!
The answer to this question is 12y.
If Carlos must place all the books on shelves, he may possibly use 10 shelves if he is to place 4 books per shelf, or 5 shelves if he is to place 8 books on each.