Question

Marcos purchases a top-up card for his pre-paid cell phone.

Marcos purchases a top-up card for his pre-paid cell phone. His remaining balance, B, can be modeled by the linear equation


B=50-0.3n


Where n is the number of minutes he's talked since purchasing the card.

What is the slope of this equation?

The remaining balance on Marcos' card _______  for each minute he taiks on the phone.



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Answer #1

B=50-0.3n

or, B=-0.3n+50

comparing it with y=mx+c

slope = -0.3

the remaining balance on marco's card decreases by 0.3 for each minute he talks on the phone

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