An internet service provider charges $18 per month plus an initial set-up free. once customer paid a total of $81 after two months of service. write an equation for this situation.

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answer: it actually depends on which is the independent variable and which is the dependent variable. let us say we're looking at a linear equation. y=2x+3. we theoretically could switch the equation to be x=(y-3)/2 and it would be the same line. so either a causes b or it can be that b causes a. so technically the answer is false

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