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1. Charlie bought a new computer for $450 with his credit card. He plans to pay the minimum payment

of $25 per month. What is the rate of change, including units ?

User Rickster
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1 Answer

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Given:

Charlie bought a new computer for $450 with his credit card.

He plans to pay the minimum payment of $25 per month.

To find:

The rate of change.

Solution:

Let y be the remaining amount of loan after x months.

Initial amount of loan = $450

Payment of one month = $25

Payment of x months = $25x

Now,

Remining amount = Initial amount of loan - Payment of x months


y=450-25x ...(i)

The slope intercept form is


y=mx+b ...(ii)

where, m is slope and b is y-intercept.

From (i) and (ii), we get


m=-25

Therefore, the rate of change is -25 dollars.

User Francisco Gomes
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