Answer: 2x+5y=100 and x+y=38
Step-by-step explanation:
To get the answer, you divide the length of the board by the size of the pieces wanted, so the equation you get is
9/1.5 = 6
So you can get six 1.5in shelves from a 9ft board
This is pretty obviously

If it wasn't obvious we can find the common ratio r by dividing successive values:
5/1=5
25/5=5
125/25=5
625/125=5
That's the common ratio. We multiply by the first term, but the first term is one, so that has no effect.
Answer:
Here you go.
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This graph is the correct one