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Describe whether each of the following is linear or not linear. In each case, explain your answer.

A3x+4y+2=0

BX= 2,4,6,8 Y=1,5,15,30

CYou have a secret that you tell to one person. Every hour, each of the people that know the secret tells one person. The number of people who know is N, and t is the number of hours since you told the first person. Is N a linear function of t?