for each relation,describe the domian and range.determine wh

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for each relation,describe the domian and range.determine whether the relation is a function.explain your reasoning
数据：第一题：（200,5）（150,4）（100,3）（-200,5）
第二题：（25,1）（32,8）（25,2）（46,5）（31,-2）
有追加分（20）

第一题：是
第二题：不是
函数可以多对一但不能一对多
第2题(25,1) (25,2)显然是一对多
explaination:
A function associates a single output to each input element drawn from a fixed set. Although different inputs may have the same output, only one output can be related to an input.

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