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Answer :

Data:

Enrollment: $79

Charge per Month: $45/month

x: number of months

y: Total cost

You can follow the next general expression:

[tex]y=kx+b[/tex]

Where k is the constant of change, in this case the charge per month, and b is the charge at time 0, in this case the charge per enrollment.

Then, You get the next expression that represents the relationship:[tex]y=45x+79[/tex]