algebra

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The value, v, of a shopkeepers inventory software program is given by v= -1/2t+5, where t is the number of years since the shopkeeper bought the program. What is the program worth four years after it is 1st purchased. Plot the point with the given t-value, 4.

I have made calculations of
-1/2t(0) + 5 = v 5 (0,5)
-1/2t(4) + 5 = v 3 (4,3)
-1/2t(2) + 5 = v 4 (2,4)
-1/2t(8) + 5 = v 1 (8,1)

On the graph I cannot figure out how to plot t4. The only way the lines will go is from 0 on both sides.

Can someone help me with this without a graph to show me?

Thanks so much.

  • algebra -

    Go to:

    rechneronline.de/function-graphs

    When page be open in blue rectangle type:

    -0.5*x+5

    In Range x-axis type -6 to 14

    In Range y-axis type -2 to 8

    Then click option Draw

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