Question 83382
The problem tells you that the price (p) of a car that is 1-year old is seven-tenths or 0.7
times the original price (x).  
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To get the equation, just write the information in equation form:
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p = 0.7*x
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This equation reads: "the price p of a car that is one year old is seven-tenths times the
original or price when new (called x) of the car."
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Hope this helps you to understand the problem.