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LifeIsADangerousGame

  • 4 years ago

How do I do this equation?

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  1. LifeIsADangerousGame
    • 4 years ago
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  2. UnkleRhaukus
    • 4 years ago
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    if the equation is of the form y=mx+b then b is the y intercept, ie 3

  3. Mertsj
    • 4 years ago
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    A

  4. Mertsj
    • 4 years ago
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    y intercept is 2 1/2

  5. LifeIsADangerousGame
    • 4 years ago
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    I don't really understand how to get the equation..

  6. UnkleRhaukus
    • 4 years ago
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    and the gradient is negative ( slopping down across x

  7. Mertsj
    • 4 years ago
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    If you notice, there are two points that are marked on the graph. One is (-1,3) the other is (5,0). Use those two points to find the slope.

  8. Mertsj
    • 4 years ago
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    Can you do that?

  9. LifeIsADangerousGame
    • 4 years ago
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    Yea, so that means it's -3/6?

  10. Mertsj
    • 4 years ago
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    Yes. Reduce that to -1/2

  11. Mertsj
    • 4 years ago
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    Now use point-slope form and plug in the slope and one of the points to find the equation.

  12. Mertsj
    • 4 years ago
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    Can you do that?

  13. Mertsj
    • 4 years ago
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    Based on the answer choices, you might want to use the point (-1,3)

  14. LifeIsADangerousGame
    • 4 years ago
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    I don't really understand this last part, do I put it in one of the equations on the screen or a whole seperate one?

  15. Mertsj
    • 4 years ago
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    Here is point-slope form:

  16. LifeIsADangerousGame
    • 4 years ago
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    y = mx + b right?

  17. Mertsj
    • 4 years ago
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    \[y-y _{1}=m(x-x _{1)}\]

  18. LifeIsADangerousGame
    • 4 years ago
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    oh

  19. Mertsj
    • 4 years ago
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    replace m with -1/2 which is the slope. Replace x1 with -1 and y1 with 3 because you are using the point (-1,3)

  20. LifeIsADangerousGame
    • 4 years ago
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    so y - 3 = -1/2(x + 1)?

  21. Mertsj
    • 4 years ago
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    Exactly. Isn't that one of the choices?

  22. LifeIsADangerousGame
    • 4 years ago
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    Yea! It's A! Thanks Mertsj! Wish I could give you more than one medal.. :/

  23. Mertsj
    • 4 years ago
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    Thank you. Glad to help. Now do a couple more problems like this so you really learn it!

  24. LifeIsADangerousGame
    • 4 years ago
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    Thanks again :)

  25. Mertsj
    • 4 years ago
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    yw

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