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anonymous

  • one year ago

Can you help me... I WILL GIVE MEDALS!!! What is the equation of the graphed linear model? y = x +

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    Remember that the equation of a linear function is: y = mx + b Where m is the slope of the line and b is the y-intercept.

  3. anonymous
    • one year ago
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    b is easiest to solve here, it's the y-value where the line crosses the y-axis. In other words, it's the y-value of x=0.

  4. anonymous
    • one year ago
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    Is the slope-2?

  5. anonymous
    • one year ago
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    The slope of the line is equal to the rise and run between two points. I will choose two points: (0, 110) and (20, 70). The rise is: 70 - 110 = -40. The run is: 20 - 0 = 20. Rise/Run gets us: -40/20 = -2. So you are correct.

  6. anonymous
    • one year ago
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    Are you able to complete the linear equation from here?

  7. anonymous
    • one year ago
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    is it y=x+(-2)?

  8. anonymous
    • one year ago
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    Sorry, but that is not correct. y = mx + b Simply substitute the variable m for your numeric slope value and replace b with the y-intercept :)

  9. anonymous
    • one year ago
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    So, y = -2x + b

  10. anonymous
    • one year ago
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    Can you tell me what b is?

  11. anonymous
    • one year ago
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    I got -50

  12. anonymous
    • one year ago
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    The y-intercept is where the line crosses the y-axis. Can you see that the line crosses the y-axis at y=110?

  13. anonymous
    • one year ago
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    yes

  14. anonymous
    • one year ago
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    Using this information, are you able to complete the equation?

  15. anonymous
    • one year ago
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    idk can u help me more?

  16. anonymous
    • one year ago
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    Sure. Can you tell me what is confusing you?

  17. anonymous
    • one year ago
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    Well I must be doing something very wrong... I keep getting -50.

  18. anonymous
    • one year ago
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    For b

  19. anonymous
    • one year ago
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    @IParke ?

  20. anonymous
    • one year ago
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    Sorry about that. Are you solving for b algebraically? The y-intercept (b) is the value of y when x=0. Since we've already found the slope, we have the equation: y = -2x + b, correct? So what is y equal to when our x = 0?

  21. anonymous
    • one year ago
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    ?. Sorry I'm blanking. Can I get another hint?

  22. anonymous
    • one year ago
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    R u there?

  23. anonymous
    • one year ago
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    |dw:1433907329394:dw|

  24. anonymous
    • one year ago
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    |dw:1433907399077:dw|

  25. anonymous
    • one year ago
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    I am sorry if I am being confusing. Let's start over and take it slow. I'm going to assume that you know how to do slope since you did that so well.

  26. anonymous
    • one year ago
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    yes. is it 110?

  27. anonymous
    • one year ago
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    You got -2 for the slope value. The slope value is m. In our equation for a line: y = mx + b, we can replace m with the -2 you found for slope.

  28. anonymous
    • one year ago
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    It is 110 :)

  29. anonymous
    • one year ago
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    Do you know algebra?

  30. anonymous
    • one year ago
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    Not really

  31. anonymous
    • one year ago
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    Thank You so much!!

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spraguer (Moderator)
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