Lola bought x pencils that cost $0.25 each and y erasers that cost $0.50. she spent less than $3. which graph represents lola’s purchase?

Lola bought x pencils that cost $0.25 each and y erasers that cost $0.50. She spent less than $3. .
Here are some possibilities of her purchase.
=> 8 pencils = 2 dollars and 2 erasers = 1 dollars 
=> 3 erasers = 1.50 dollars and 6 pencils = 1.50 dollars.
=> 10 pencils = 2.50 dollars and 1 eraser = .50 dollars
=> 4 pencils = 1 dollars and 4 erasers = 2 dollars.
=> 2 pencils = 0.5 dollars and 5 erasers = 2.5 dollars

What the heck don’t understand