Question 462756
The value, v, of a shopkeeper's inventory software program is given by 
{{{v =(-1/3)t+4}}}
where t is the number of years since the shopkeeper bought the program. What is the program worth 9 years after it is first purchased? Plot the point with the given t-value,9.
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The equation you have given us here tells us the relationship between time and the value of a software program. As the years go by, the program will be worth less and less.
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Using the equation, the shopkeeper (or you) can calculate the exact value (the variable v) of the software for any number of years (the variable t). Here's how it works:
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We want to know the value of the software after 9 years have gone by, so we let t=9. Substitute 9 for t in the equation to find the specific v when t=9.
{{{v =(-1/3)t+4}}}
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{{{v =(-1/3)(9)+4}}}
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{{{v =(-3)+4}}}
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{{{v=1}}}
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After 9 years, the software program has a value of 1.
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{{{
drawing( 400, 400, -5, 15, -5, 15,
  grid( 1 ),
  line( 0, 4, 12, 0 ))
}}}


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hope this helps!
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Ms. Figgy
math.in.the.vortex