SOLUTION: Hello, I am having problems trying to convert a real-life situation and create an equation or inequality that could be used for analysis, prediction, or decision making. I have to

Question 103026: Hello, I am having problems trying to convert a real-life situation and create an equation or inequality that could be used for analysis, prediction, or decision making. I have to draw a graph to depict the variables in my situation. Lastly, I have to use my graph and what I know about linear inequalities to discuss the significance of my findings. The situation that I have created so far is the following:
"Last year, I had bought a brand new �06� Pontiac Vibe. Now as time goes by, the selling price for my car decreases in value as it becomes older. In this situation, the equation of the selling price is y = -Ax + B, the B represents the minimum price at which I would sell my car and A is the slope of increment. Since the selling price decreases in value within each passing year, the slope appears with a negative sign. The negative slope indicates the amount by which the selling price decreases per year."
I don't have exact figures, I was just going to make up the figures. I have the scenario, but now I don't know what to do from here. Please Help, Thank You so much!!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
I have to draw a graph to depict the variables in my situation. Lastly, I have to use my graph and what I know about linear inequalities to discuss the significance of my findings. The situation that I have created so far is the following:
"Last year, I had bought a brand new �06� Pontiac Vibe. Now as time goes by, the selling price for my car decreases in value as it becomes older. In this situation, the equation of the selling price is y = -Ax + B, the B represents the minimum price at which I would sell my car and A is the slope of increment. Since the selling price decreases in value within each passing year, the slope appears with a negative sign. The negative slope indicates the amount by which the selling price decreases per year."
-----------------
B is not the minimum price; B is the current value of the car; it is the
value of the car when x=0 and x=0 means NOW.
---------------
If you think the car is now worth 10000 let B = 10000.
If you think the car decreases in value by $400 each year
let A = 400
Then you get y = -400x + 10000 where y is the value of
the car x years from now.
---------------------------
You can graph the equation by plotting two points, like (0,1000)
and (2,9200) and drawing a line thru them.

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Cheers,
Stan H.
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