#Algebra 1 help. 2 questions

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hallow root
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Attached are 2 Algebra 1 questions I need help answering. One of them, I sort of have an idea as to why it is not a solution (#2), while the other I don't get how to do at all (#5).

hallow root
mint spruce
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,rotate

cloud spearBOT
rough turret
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For a relation to be funtion, an element in the domain should have only one image in the range.