Answer:
(4, 0)
Step-by-step explanation:

x=4 when y=0, and in x-intercepts, we are trying to find the value of x when y=0, which is why (4, 0) is the point of interception.
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A: number of nonfiction books
b: number of fiction books
a+b=2000
a=3b
b=500
a=1500